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Is Air Harmful to Lubricant Oil?
2019 / 10 / 28
Lubrication system is a key part of all kinds of machinery and equipment, and one of the maintenance points is that it cannot bring impurities. So lubrciant oil contains detergent or dispersant. However, we generally pay attention to dust, particulate impurities, moisture and other pollutants, overlooking the air. Air will affect the performance of the lubricating oil. Although the lubricant oil will inevitably come into contact with the air, the air mixed in the lubricant oil, will have a negative impact on the lubrication. Under normal circumstances, the lubricating oil will slowly oxidize after it contacts the air, but this process is slow and inevitable and normal, but if the air enters the inside of the lubricant oil, it's a big problem. There are three types of air mixed in the lubricant oil: air dissolved in the oil, suspended, and bubbles that cannot be released inside the oil, and foam on the oil surface. Among them, the most harmful to the machine and lubricant oil is the air bubbles that are suspended and retained in the oil. The foam will collect and float on the oil surface, and the volume is relatively large. If foam occurs, it is generally necessary to be aware of the formation of bubbles inside the oil. The air bubbles are suspended and retained in the interior of the oil, which is small in size but harmful. Air bubbles can cause oil turbidity. If the oil is turbid, you can take some oil samples. If stratification occurs, the turbidity of the oil is caused by water or other liquid contamination. If it is left to stand for a while, the oil sample will be clear, and bubbles will be mixed into the oil.
Formation And Solution Of Cutting Fluid Oil Mist
2019 / 10 / 25
Formation And Solution Of Cutting Fluid Oil Mist In the process of using cutting fluid, a lot of friction and high temperature are produced between cutting fluid and metal workpiece, cutter and debris, which results in an oil mist problem. The oil mist will affect the environment of metal processing workshop and the respiratory health of people. The formation of oil mist in metal cutting fluid can be attributed to two mechanisms: atomization and evaporation.: 1.Atomization is a process in which mechanical energy is converted into droplet surface energy. It is mainly due to the exciting impact of the liquid on the fixed and rotating units in the machine tool system, which is broken and forms small droplets floating in the working environment. 2. Evaporation is caused by a large amount of heat generated in the cutting area, which is transferred into the cutting fluid so that its temperature is significantly higher than the saturation temperature, and then boiling occurs on the solid-liquid contact surface and generates steam. The air then condenses with small droplets or other particles in the surrounding air to form an oil mist.
How to Choose the Eight Oil Grade for Car?
2019 / 10 / 25
Many people are caring for their own cars through buy the lubricant oil by theirself, or going to the repair shop outside, they will face the problem of choosing their own oil. Is it fully synthetic or ordinary? What brand? What viscosity? What level? The brand of oil is not very important, as long as the oil is genuine, it is no problem to choose several major brands. Is it fully synthetic or ordinary? If the original car is use ordinary lubricant, it can be used ordinary, you can also choose a better full synthesis. As for the viscosity of the oil, you must choose the same as the original engine oil, otherwise it's easy to have some problems. There is a parameter that most car owners will ignore, that is the oil quality level. The same brand of motor oil, whether it is fully synthetic or ordinary, has different quality levels. The higher the quality level, the better the performance of the oil and the more expensive the price. The oil quality grade is an important criterion developed by the American Petroleum Institute to measure the quality of oil and the quality of oil. The gasoline engine oil or gasoline engine oil additive package is start with S. From SA, SB, and SC to SN, the letters after S are sequentially increased. The lower the letter, the higher the oil quality level. Oils like SA, SB, and SC are decades old, and they are no longer visible. The lowest grade of oil that can be bought today is SJ, which is almost the same
What's the Difference Between Lubricant Oil And Grease?
2019 / 10 / 24
What is the difference between lubricant oil and grease? Many people don't have a clear distinction, and some people think that lubricant oil is grease. As the name suggests, lubricants and greases are used to lubricate machinery, but why do some machines only use grease and some mechanical lubricants? I believe many of people maybe don't have a clear distinction between lubricating oil and grease. Even many people think that lubricating oil is grease. Today, I came to talk to you about the difference between lubricant oil and grease. Grease is composed of base oil, lubricant additive and thickener, Lubricant oil is composed of base oil and lubricant additive. Generally speaking, grease is plastic lubrication composed of one or several thickeners and one or several lubricant liquids. In order to improve the performance, the grease has more thickener than the lubricating oil component, and the grease has the advantage of being able to stay on the lubricating surface. It is suitable for low-speed environment than lubricating oil. It has the advantages of long-term maintenance without additional maintenance and good sealing. It can effectively prevent pollutants from entering the equipment and reduce noise and vibration. It is suitable for harsh operating conditions. But the disadvantages of grease are also obvious. The viscosity is strong, the fluidity is poor, the heat dissipation is not good, the replacement is inconvenient, the amount of grease is difficult to adjust, and the function of cleaning impurities is not provided. It is also one of the reasons why car engines cannot use grease. However, the disadvantage of grease is the advantage of lubricant oil, good fluidity, good heat dissipation, easy replacement
How To Distinguish The Deterioration Of Industrial Lubricating Oil?
2019 / 10 / 23
How To Distinguish The Deterioration Of Industrial Lubricating Oil? How to distinguish the lubricating oil from deteriorated industrial lubricants will show a deep black color, and foam and emulsification; we can also use finger to polish the distinction, such as no viscosity, odor, melanin or dark brown, which can prove that the oil is deteriorating. If the deteriorated industrial lubricating oil is used, the parts will be damaged, the service life of the machine will be affected, and safety accidents may occur in serious points. We should take it seriously, and should always check whether the oil is deteriorated and replace it in time. Let me introduce you to the following. 1.Observation method By taking two measuring cups, one is filled with lubricating oil and the other is not filled with lubricating oil. Then lift the measuring cup with lubricating oil to the height of three cups. Pour the lubricating oil into the empty cup at an angle. During the observation period, the industrial lubricating oil with good quality will flow
What's the Difference Between Gear Oil GL-5 And GL-4?
2019 / 10 / 23
GL-4 is a medium-load gear lubricant oil, GL-5 is a heavy-duty gear lubricant oil, so the previous truck oil change is the GL-5-85w90. Later, due to the poor working conditions of some engineering vehicles, with GL-5-85W140 grade gear oil, this gear oil has higher viscosity, better lubricity and high temperature resistance than ordinary gear oil, and then gradually popularized. Most of the gear oils of GL-5-85W140 are used. GL-5 grade gear oil contains more sulfur than GL-4 grade oil, half more acid than GL-4 gear oil, acidic material will corrode metal, so the corrosion of GL-5 is much higher than the GL-4. Since the gear load is generally above 490 MPa, and the hyperbolic tooth surface load is as high as 2942 MPa, in order to prevent the oil film from rupturing and causing tooth surface wear and abrasion, Antiwear EP Additive are often added to the gear oil, and sulfur is commonly used. Phosphorus or sulfur-phosphorus-nitrogen lubricant additive. In general, ordinary freight vehicles can be filled with more than 12 liters, 100,000 kilometers or a year of oil you can change the gear oil. Due to the low fuel quantity, it is recommended to replace the truck type of the light truck at 50,000-80,000 km. Our company are mainly produce Lubricant Additive
What's the Advantages of Synthetic Lubricant?
2019 / 10 / 22
With the continuous upgrading of lubricant technology, many mineral oils can not meet the requirements of customers even if they are added with lubricant additive, so synthetic lubricant have entered the automotive maintenance market. Synthetic lubricants are prepared by chemical synthesis and have unique advantages than mineral lubricants. However, the synthetic lubricant raw materials are expensive and the process is complicated, and the price is relatively high. So what are the advantages of synthetic lubricants? 1, Low Pour Point The synthetic lubricant base oil has stable molecular form, low pour point and good fluidity. It can quickly reach the moving parts at the moment of cold start, reduce the friction at the starting moment and reduce the cold start wear of the engine. 2, High Viscosity Index Synthetic lubricant oil has a high viscosity index and strong anti-oxidation ability. Under the high temperature environment of the engine, the oil can maintain the viscosity stability and reduce the evaporation of the oil. 3, Oil Film Strength is High Synthetic Lubricant When the engine is in a harsh environment with high temperature and high shear, the strength of the oil film is stable and not easily broken, thus effectively extending the life of the engine. 4. Good Circulation and Oil Change Period is long Synthetic lubricating oil has low impurity content
How To Remove Water From Lubricating Oil?
2019 / 10 / 22
How to remove water from lubricating oil? If water enters into the lubricating oil, the equipment will suffer. Therefore, the earlier it is found, the better. If water is detected as early as possible and the root cause is dealt with as soon as possible, the physical and chemical properties of the lubricating oil will be prevented from being damaged. If water enters into the lubricating oil, it is necessary to remove the water in time. Here are several common methods of lubricating oil water removal: 1.Natural settlement method: Only free water can be removed, and lubricating oil is lighter than water. Through gravity, water can drain the water in the lower layer after the oil tank settles, but it is not suitable for emulsified water and dissolved water. 2.Centrifugal oil water separation: It is more effective than gravity sedimentation to separate water, but it is not applicable to dissolved water and emulsified water. 3.Vacuum water removal: When the temperature rises, the water in the lubricating oil can be evaporated by drying, but the high temperature will damage the performance of the lubricating oil. The vacuum water removal technology places the
Feeding Sequence in the Production of Lubricant Oil
2019 / 10 / 21
Lubricant oil is a liquid or semi-solid lubricant used in various types of automobiles and machinery to reduce friction and protect machinery and processed parts. It mainly functions as lubrication, cooling, rust prevention, cleaning, sealing and buffering. It is generally composed of two parts, a base oil and an additive. Base oil is the main component of lubricant oil, which determines the basic properties of lubricating oil. Additives can make up for and improve the performance of base oil, and give some new properties. It is an important part of lubricant oil. The order of addition of lubricants is as follows: 1. Feeding Sequence of the lubricant oil is: First add the base oil. When the temperature of the base oil is raised to 60°, join in order Antifoam Additive, Pour Point Depressant, Viscosity Index Improver and Additive Package are sequentially added. Each time a different material is added for 10 minutes, different feeding sequences may affect the anti-foaming performance, pour point, and may cause precipitation of additives when severe. 2. Generally, the temperature of the internal combustion engine oil is 70±10°, and the temperature of the gear oil and hydraulic oil is controlled at 60±10°. 3. If the base oil contains traces of water, the base oil is heated to 110° without any additives and stirred for 30 minutes. As a professional Manufacturer of Lubricant Additive for years, Our products incl
Introduction to storage period of lubricating oil
2019 / 10 / 21
Introduction to storage period of lubricating oil As a professional lubricant manufacturer and supplier, we can provide customers with different products and high-quality services. Here are the storage conditions and precautions for lubricants. Different from general food and medicine, lubricant has no strict shelf life. Because the performance of lubricating oil is relatively stable, as long as it is stored properly, it generally will not affect the use. Therefore, the state does not stipulate the warranty period or validity period of lubricating oil. Under the normal storage conditions of room temperature sealed state, dust-proof, water-proof and chemical smoke proof, the oil products have been stored for more than three years without any change in various indexes. For the storage of lubricating oil, the following points should be noted:
What Factors Can Affect Engine Oil Consumption?
2019 / 10 / 18
There are many reasons for engine oil consumption, among which the factors related to lubricant oil are as follows: 1. The viscosity is not suitable, too large viscosity or too small viscosity will cause engine oil consumption. Oil consumption is easy to be too fast in oil change season, for example, oil change from winter to summer or oil change from summer to winter are two fastest oil consumption seasons. 2. A large number of Viscosity Index Improver are added to the formula, and the viscosity drops too fast in the driving process, resulting in too fast oil consumption. 3. Add non-standard oil, because the oxidation resistance of non-standard oil is not good, it will thicken the oil and cause oil consumption. If add standard oil, it including suitable Lubricant Additive Component or Additive Package, It won't cause oil consumption is too fast. 4. Low quality fuel oil used. 5. The maintenance of the original car is poor. It can shorten the oil change period. It can be changed several times continuously, which can be solved in general. As a professional manufacturer of Lubricant Additive for years, Our main products including Lubricant Additive Package, Lubricant Additive Component and Metal Working Fluid etc.. If you interested in them or you w
Is It Necessary to Add Extra Antiwear Additive When Use Engine Oil?
2019 / 10 / 17
If the older lubricant experts answer, more than 90% of the answer is "no"! A lot of people agree that qualified engine oil itself already has the balanced compatibility of lubricant additive, and the research on the balanced compatibility of additives has been repeatedly verified and approved by many people's efforts in bench test, adding extra Antiwear EP Additive may break the original balance, or bring negative impact. Some studies have shown that organic molybdenum compounds have quite poor antioxidation performance behind their outstanding antiwear effect. For this reason, many people call for not taking time and effort to increase antiwear additive under the condition of correct use of oil. Some experts even think that these additives need relevant bench data to be convincing. Is the antiwear agent worth using? Is it necessary? As a professional manufacturer of Lubricant Additive for years, I think that we should take an objective attitude towards this kind of dispute. If it proves to be effective after use, we should encourage people to try. Our main products including Lubricant Additive Package, Lubricant Additive Component and M
How To Identify True And False Antiwear Agent
2019 / 10 / 16
How to identify true and false Antiwear Agent Antiwear agent is a kind of high-tech engine oil (lubricating oil) additive. The antiwear agents commonly used in lubricating oil include sulfur antiwear agent, phosphorus antiwear agent, sulfur phosphorus antiwear agent, halogen antiwear agent, organic metal antiwear agent and boron antiwear agent, which can reduce engine wear and increase engine power. Therefore, it is also called engine maintenance agent or strong repair agent, which can extend engine oil. It can save fuel and improve power. Here are some identification methods: 1. add a certain proportion of anti-wear agent into the product oil of an engine oil, and then analyze the clean dispersion, anti-oxidation and anti-corrosion properties of the oil. If it is significantly worse than the original engine oil, even if the anti-wear effect of the anti-wear agent is good enough to affect other properties of the engine oil, it can not be reused.
How to Identify the Fake and Inferior of Automotive Gear Oil?
2019 / 10 / 15
The quality of automotive gear oil with low quality on the market is mainly manifested in two aspects: 1. The composition of base oil is poor. Qualified gear oil is blended with standard base oil. Fake and inferior products are added with residue, asphalt oil, inferior rubber oil, light deoiling and extraction oil. These components have poor thermal stability, poor viscosity and temperature, dark color, easy stratification or precipitation during storage. 2. Gear Oil Additive Package are poor in composition or without additives at all, and the quality of additives for fake and inferior products is low. Or use Lubricant Additive Component or Additive Package which have been phased out. Some of the additives are not enough or the ratio is improper, and the performance is not good. How to distinguish the authenticity of lubricating oil? Reference can be made to the following methods: (1)Look at color: Qualified oil products are uniform in appearance, transparent to light, and fake and inferior products are black with poor transparency. Sometimes stratification or sediment can be observed at the bottom of the tank. (2)Smell: Modern GL-4 and GL-5 oils are mostly formulated with sulfides and do not use chlorinated paraffins, so they have a pungent thionene odor when heated slightly. There is no such flavor or additive or poor quality with chlorinated paraffins.
Chinese Market Analysis on Lubricant and Lubricant Additive
2019 / 10 / 14
Around 7million tons demand for Chinese lubricant oil market, PetroChina/Sinopec occupy 44%, private enterprises occupy 26%, others about 30% for imported or joint venture brands. Counted as 4% average dosage, additives annual consumption quantity is about 280,000tons. PetroChina/Sinopec 168,000tons, private enterprises 112,000tons. Chinese lubricant market grows about 8% every year, the additives demand is growing at the same time. Because Chinese additives (currently mainly component) technology improved and developed, Chinese additives market share will keep faster increase. As a professional supplier of
If add the antiwear additive, Can cars overloaded?
2019 / 10 / 14
Some manufacturers or salesmen boast to their owners that their Antiwear EP Additive can withstand heavy loads in order to promote the antiwear products they produce. When antiwear EP additive are added to the car, they can overload.This greatly meets the needs of many car owners. At present, many cars still have overloading problems. On the one hand, the owners want to gain more benefits through overloading, on the other hand, they are worried about the excessive damage of overloading to the car. The "function" of antiwear additive "solves" their worries, so they are happy to spend money on antiwear additives. In fact, it's just a kind of lubricant oil additive supplier saying of the antiwear agent manufacturer. It just uses the psychology of the owner. It's not that the antiwear additive really has this special function, that is to say, adding the Antiwear EP Additive to the overload of the car is no problem. It's true that the antiwear additive EP additive can improve the antiwear performance of the oil pressure of the machine, and allow the engine parts to bear the original larger load. But the overload of the car is the weight added to the whole body of the car, not one part of the engine is so simple, to say the least, even if the engine can bear too much weight, the body, frame and wheels? Therefore, no matter adding Lubricant Additive Component or Additive Pacakge, the car should not be overloaded.
How to Choose 2T and 4T Motorcycle Oil Correctly
2019 / 10 / 14
How to Choose 2T and 4T Motorcycle Oil Correctly As we all know, two-stroke motorcycles are mixed combustion, that is, engine oil and gasoline are mixed together, 2T oil is a one-time oil, no residual waste oil after use. Four-stroke motorcycles, like automobiles, are separated and lubricated. The 4T oil used is not mixed with gasoline, and has a separate mailbox. After a period of use, there is residual oil. There are many differences between 2T oil and 4T oil, as shown in the following table: Item 2T oil 4T oil Apperance Red (or other colors) General oil color Smell
How to distinguish True and False Antiwear Additive?
2019 / 10 / 11
There is no uniform international standard for nursing products, so there is no recognized authoritative criterion to determine which additive is true and which is false. For the vast number of users, the only feasible way to identify is to refer to the performance test method of oil, which is introduced as follows: 1. A certain proportion of Antiwear EP Additive was added to a certain oil product, and then the detergent and dispersant (Detergent and Dispersant Additive ), Antioxidation additive and Anticorrosion properties of the oil were analyzed. If it is worse than the original oil, even if the antiwear effect of the antiwear additive is better, it will affect the other properties of the oil, which is not available. This discriminant method is more scientific and convincing for users with analysis conditions. 2. If the heating antiwear additive can't withstand high temperature, obvious blackening, odor, stratification and so on, its effect is limited, it's not suitable for choose. 3. When antiwear additive are stirred or heated with a small amount of water, white powders will precipitate during a period of time. These additive is better and can be used.
Brief Introduction of Lubricant Additive Ashless Dispersant
2019 / 10 / 10
Lubricants are composed of a base fluid and additives. The base fluid can be mineral, synthetic, or biological in origin. In terms of use, petroleum-derived (mineral) base fluids top the list, followed by synthetic fluids. Base oils of biological origin, that is, vegetable and animal oils, have not gained much popularity except in environmentally compatible lubricants. This is because of the inherent drawbacks these base oils have pertaining to their oxidation stability and low-temperature properties. Additives are added to the base fluid either to enhance an already-existing property, such as viscosity, of a base oil or to impart a new property, such as detergency, lacking in the base oil. The lubricants are designed to perform a number of functions, including lubrication, cooling, protection against corrosion, and keeping the equipment components clean by suspending ordinarily insoluble contaminants in the bulk lubricant. Although for automotive applications all functions are important, suspending the insoluble contaminants and keeping the surfaces clean are the most critical. As mentioned in on [detergents," this is achieved by the combined action of the detergents and the dispersants present in the lubricant. Dispersants differ from detergents in three signifcant ways: 1. Dispersants are metal-free, but detergents contain met
Market Analysis Of Lubricating Oil Industry
2019 / 10 / 10
Market Analysis Of Lubricating Oil Industry With the continuous development of the global automotive industry, the car ownership has been rising, and the demand for lubricants has been increasing. Although the global supply and demand for lubricants have shocked, they have basically maintained stable growth. China is a big automobile producer, and the car ownership is also increasing year by year. The demand for automobile lubricants is the main factor to promote the scale of China's lubricant industry. At present, the import quantity of lubricating oil industry in China is still larger than that of export. The imported lubricating oil is mainly high-end and special lubricating oil. Lubricating oil generally consists of base oil and additives. Base oil is the main component of lubricating oil, which determines the basic properties of lubricating oil. Additives make up for and improve the deficiencies of base oil performance, and give new performance, which is an important part of lubricating oil. Base oil, as the lower end product of crude oil industry chain, is extracted from petroleum by physical distillation. According to the classification criteria proposed by the American Petroleum Institute (API), base oils can be divided into five categories according to saturated hydrocarbon content, viscosity index and sulfur content. At present, China's base oil consumption is mainly based on API type I base oil and API type II base oil and non-standard products.
Global Demand for Lubricant Additives Reached 4.4 Million Tons in 2023
2019 / 10 / 09
With the development of industrial technology, the high speed, high performance, high automation, high efficiency and long service life required by modern equipment. It is difficult to use mineral oil lubricant alone in lubrication. Adding a small amount of other substances in lubricating materials can improve its performance and give it new characteristics. These substances are called additives to lubricants. Lubricant oil additives can be divided into Detergent, Dispersant, High Temperature Antioxidant, Corrosion Inhibitor, Antiwear EP Additive, Pour Point Depressant ect..And different additives have different effects. Adding different additives to oil products is the most economical and effective way to improve oil quality. Generally speaking, the variety and quality of lubricating oil often depend on the variety and quality of additives. Therefore, the development of production and use of additives has become an important way to make rational and effective use of resources, improve equipment performance and save energy. According to the June 9 Report of Chemistry Weekly, USA, IHS Markit's latest research report shows, In 2018, the global market demand for lubricant additives reached 4.2 million tons, with a market value of abo
Brief Introduction of Lubricant Additive Detergent
2019 / 10 / 08
Brief Introduction of Lubricant Additive Detergent Modern equipment must be lubricated to prolong its lifetime. A lubricant performs a number of critical functions. These include lubrication, cooling, cleaning and suspending, and protecting metal surfaces against corrosive damage. Lubricant comprises a base fluid and an additive package. The primary function of the base fluid is to lubricate and act as a carrier of additives. The function of additives is either to enhance an already-existing property of the base fluid or to add a new property. The examples of already-existing properties include viscosity, viscosity index, pour point, and oxidation resistance. The examples of new properties include cleaning and suspending ability, antiwear performance, and corrosion control. The extent of the desirability of various properties differs from lubricant to lubricant and largely depends on the conditions of use. Automotive use, for example, requires lubricants with good oxidation resistance, suitable low and high temperature viscosities, high-viscosity index (i.e., minimum loss in viscosity with an increase in temperature), and good cleaning and suspending ability. Conversely, the use as nonautomotive lubricants, such as industrial and metalworking lubricants, emphasizes oxidation resistance, antiwear performance, corrosion control, and cooling ability.
Introduction Of Antifoaming Agent For Lubricating Oil
2019 / 10 / 08
Introduction of Antifoaming Agent for Lubricating Oil During World War II, the foaming of lubricants used by American aircraft and vehicles caused serious problems. In order to find out the principle and solution of lube oil foaming, some oil companies and research institutes at home and abroad have studied it. In 1943, the company and Gulf company also discovered that liquid organosiloxane is a very effective antifoaming agent, so far it is the most important anti foaming agent in lubricants. At present, there are three main types of anti-foaming agents in the market: silicon-containing, non-silicon and composite anti-foaming agents. Here are the following anti-foaming agents. Performance of Antifoaming Agent: There are many reasons for the foaming of lubricating oil. Firstly, the oil itself is oxidized; secondly, the high-speed stirring of lubricating oil containing air; thirdly, various additives are used in oil products, especially those with active surface; there are several ways to solve the foaming of lubricating oil: physical anti-foaming method, mechanical anti-foaming method, chemical anti-foaming method, among which chemical anti-foaming method is the most commonly used.
How To Use P/N/S Sontaining Additives in Automotive Engine Oil
2019 / 09 / 30
Vehicle emissions legislation (e.g., in the United States, Europe, and Japan) now exists to control and substantially reduce the levels of particulates, hydrocarbons, carbon monoxide, and oxides of nitrogen in the engine exhaust. The engine manufacturers have met these requirements by a variety of design changes that impact the composition of oils and fuels in the following ways: • The introduction of catalytic converters to oxidize the hydrocarbon and carbon monoxide components to carbon dioxide and water, and reduce the nitric oxide (NO) to nitrogen, has been very successful in reducing emissions. When they operate at their normal operating temperature and optimum level of effciency, they are almost 100% effcient and most of the remaining emissions occur in the time before the catalyst reaches [light-off" temperature. Many studies into reducing this period to achieve yet lower emissions have been conducted. Although much success has been achieved, further progress may be hindered by the formation of a deactivating flm on the catalyst surface by the phosphorus from the ZDDP antioxidant and AW/EP additive. As a consequence, there is pressure to reduce the phosphorus content of engine oils to minimize catalyst fouling. Currently, oil specifcations such as ILSAC GF-4 and ACEA Cx limit the phosphorus content of both diesel and gasoline engine oils to 0.05–0.09% wi
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