Alcohol-resistant low-viscosity lubricating oil composition and use thereof

Abstract

The application provides an alcohol-resistant low-viscosity lubricating oil composition and application thereof, and the composition of the lubricating oil composition comprises 0.6-1.0% of a metal detergent, 6.0-10.0% of an ashless dispersant, 0.5-2.0% of an anti-oxidation and anti-wear agent, 1.0-2.0% of a metal deactivator, 0.2-1.0% of an extreme pressure and anti-wear agent, 3.0-5.0% of a viscosity index improver, 0.1-0.2% of a pour point depressant, 0.001-0.010% of an anti-foaming agent, 30.0-50.0% of a CTL base oil, and the rest is an API III base oil. The lubricating oil composition has excellent anti-wear durability and low-temperature cold startability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of lubricating oil, and particularly relates to a lubricating oil composition meeting the lubricating requirements of M100 methanol passenger vehicle engines. BACKGROUND

[0002] At present, the viscosity grade of M100 methanol engine oil products is 5W-30. With the expansion of the popularization of methanol engine oil, the poor cold start performance (not starting within 5s) and large start-up wear problems (poor flowability of engine oil, which cannot reach the surface of machine parts in time to play a lubricating effect) of the engine oil in cold regions (-36℃) in winter have appeared. At the same time, in order to meet the demand for further extension of the oil change mileage, higher requirements for the wear resistance of the oil product have been put forward. SUMMARY

[0003] In order to solve the above problems, the purpose of the present application is to provide a low-viscosity alcohol-resistant lubricating oil composition and its application, which has excellent wear resistance and low-temperature cold start performance.

[0004] In order to achieve the above purpose, the present application has carried out systematic research on each type of additive and different types of base oil in the lubricating oil composition, and has carried out comprehensive and systematic research on the interaction and relationship between each component. How to solve the wear resistance and durability of the oil product is one of the key targets to be conquered. Through the effective combination of base oil, extreme pressure anti-wear agent, anti-oxidant anti-wear agent, metal deactivator and the like, the problems of the decrease of the wear resistance of the lubricating oil in the presence of methanol, formic acid and water and the poor low-temperature cold start performance of the methanol engine have been successfully solved.

[0005] The present application provides a low-viscosity alcohol-resistant lubricating oil composition. The composition comprises, calculated based on the total mass of the lubricating oil composition: 0.6-1.0% metal detergent (component A), 6.0-10.0% ashless dispersant (component B), 0.5-2.0% anti-oxidant anti-wear agent (component C), 1.0-2.0% metal deactivator (component D), 0.2-1.0% extreme pressure anti-wear agent (component E), 3.0-5.0% viscosity index agent (component F, also known as viscosity index improver), 0.1-0.2% pour point depressant (component G), 0.001-0.010% antifoaming agent (component H), 30.0-50.0% CTL base oil (component I), and the balance of API III base oil (component J). The anti-oxidant anti-wear agent comprises basic zinc dithiophosphate, amine ashless antioxidant and phenolic ashless antioxidant. The metal deactivator comprises thiazole type metal deactivator and methyl benzene triazole type metal deactivator. The extreme pressure anti-wear agent comprises sulfide type extreme pressure anti-wear agent. In the anti-oxidant anti-wear agent, the sulfur-phosphorus ratio of the basic zinc dithiophosphate is 1.8-1.9, and the zinc-phosphorus ratio is 1.1-1.2. In the extreme pressure anti-wear agent, the sulfur content of the sulfide type extreme pressure anti-wear agent is 14.0-15.0%.

[0006] According to the specific embodiments of the present application, preferably, the basic zinc dithiophosphate is basic sulfur phosphorus bis-cymber octyl salt.

[0007] The present application has carried out a lot of research work on different types of antioxidant and anti-wear agents, which are a mixture of amine ashless antioxidant, phenolic ashless antioxidant and basic zinc dithiophosphate. Zinc dithiophosphate has excellent antioxidant, anti-wear and corrosion resistance, and it is generally believed that it plays an antioxidant role by capturing free radicals and decomposing hydroperoxide. Due to the characteristics of methanol fuel, the increase of water produced by combustion greatly affects the antioxidant and anti-wear properties of neutral ZDDP. Through laboratory research, basic zinc dithiophosphate such as basic sulfur phosphorus bis-cymber octyl salt shows good system stability and wear resistance in the presence of water, alcohol and acid, and has good synergistic effect with amine ashless antioxidant and phenolic ashless antioxidant, and is particularly suitable for methanol fuel engine oil. Ashless antioxidant can provide hydrogen atoms for peroxide free radicals, destroy or prevent chain growth, and at the same time generate low-energy stable free radicals. There is also a synergistic effect between ashless antioxidants, and when phenolic antioxidant and amine antioxidant are used together, they have obvious synergistic effect because phenol helps to regenerate aromatic amine. The present application limits the addition amount of antioxidant and anti-wear agent to 0.5-2.0%, and its preferred suitable range is 0.5-1.8%.

[0008] During the use of oil, due to the presence of oxygen, heat and light, the oil is oxidized and deteriorated. If the lubricating oil contains metals such as copper and iron, these metals, especially metal ions, can accelerate the oxidation rate of the oil, generate acid, sludge and sediment, and cause corrosion and wear of metal parts. In order to avoid the catalytic acceleration of metal ions on the auto-oxidation of lubricating oil, the present application has carried out a lot of screening and compounding work on different types of metal deactivators. The metal deactivator is a mixture of thiazole type metal deactivator and methyl benzene triazole type metal deactivator. Benzene triazole is an inhibitor for non-ferrous metals such as copper and silver, and it can form a chelate with copper, which is an effective metal deactivator, but its oil solubility is poor. In order to improve its oil solubility, a derivative of benzene triazole has been developed, which has outstanding synergistic effect when used with phenolic antioxidant (2,6-di-tert-butyl-p-cresol). Thiazole type metal deactivator is a corrosion inhibitor for copper, which has the function of capturing active sulfur, thereby playing a metal deactivating role. It contains a disulfide bond, which can form a sulfide film on the surface of the metal, inhibit the catalytic oxidation of the metal to the oil, greatly improve the oxidation life and improve the hydrolysis stability. The present application limits the addition amount of metal deactivator to about 1.0-2.0% of the total weight of the lubricating oil composition.

[0009] In order to make the composition have excellent anti-wear performance, how to select and add the proportion of different types of anti-wear agents is very crucial. For example, the vulcanized olefin anti-wear agent has high anti-sintering load and good heat resistance, but poor anti-wear performance; the chlorinated paraffin has good anti-wear performance and strong activity, but poor stability, easy to cause corrosion and toxicity; the better the performance of the phosphoric acid ester amine salt anti-wear agent, the worse the thermal stability; the nano particles have the problems of poor solubility and poor stability. In the present application, the extreme pressure anti-wear agent is a sulfide type extreme pressure anti-wear agent (such as dibenzyl disulfide, etc.), and the sulfur content is 14.0-15.0%. The sulfide type organic carboxylic acid ester can also be used as the sulfide type extreme pressure anti-wear agent of the present application. Due to the existence of the polar group "ester group" with high activity in the ester oil molecule, it has good adsorption effect on the electron-rich metal surface, is beneficial to the spreading and maintaining of the lubricating oil film, has outstanding anti-wear performance, good heat resistance, good thermal stability and low corrosion, and can effectively solve the failure problem of traditional anti-wear agents caused by methanol, formic acid and water. The amount of the extreme pressure anti-wear agent is limited to 0.2-1.0%, and the preferred suitable range is 0.2-0.8%.

[0010] According to the specific embodiment of the present application, preferably, the antioxidant anti-wear agent comprises 40-60% of basic zinc dithiophosphate, 20-30% of amine ashless antioxidant and 10-20% of phenolic ashless antioxidant, calculated based on 100% of the mass of the antioxidant anti-wear agent.

[0011] According to the specific embodiment of the present application, preferably, the composition of the lubricating oil composition comprises 0.7-1.0% of metal detergent, 6.0-8.0% of ashless dispersant, 0.5-1.8% of antioxidant anti-wear agent, 1.0-2.0% of metal deactivator, 0.2-0.8% of extreme pressure anti-wear agent, 3.0-5.0% of tackifier, 0.1-0.2% of pour point depressant, 0.001-0.010% of anti-foaming agent, 30.0-40.0% of CTL base oil, and the balance is API III type base oil (preferably 30-60%).

[0012] According to the specific embodiment of the present application, preferably, the metal detergent comprises calcium salt and magnesium salt.

[0013] According to the specific embodiments of the present application, preferably, the calcium salt comprises calcium salicylate and / or calcium sulfonate, and the magnesium salt comprises magnesium salicylate and / or magnesium sulfonate. The sulfonate salt is used in engine oil, can neutralize the acidic oxide formed during the use of the engine, and inhibit the oxidation deterioration of the lubricating oil under high temperature conditions or reduce the generation of surface high-temperature deposits in the piston ring area, so as to keep the engine clean, while the non-oil-soluble gum or oxide element generated by the oxidation of the lubricating oil and incomplete combustion of the fuel can be solubilized in the oil, thereby inhibiting the tendency to generate deposits such as paint film, carbon deposition, and sludge. The alkyl salicylate is introduced with a carboxyl group on the alkyl phenol, and the metal is transferred from the hydroxyl position to the carboxyl position. This transformation makes the molecule extremely polar, greatly improves the high-temperature detergency, has good high-temperature detergency, certain low-temperature dispersion, oxidation resistance, corrosion resistance, extreme pressure and wear resistance, and good synergistic effect with other agents. Different types of detergents can be compounded to exert the synergistic effect of the additives, so that the oil has a certain base value to neutralize acidic substances, and also has good detergency, rust resistance, and low sulfated ash. The metal detergent in the present application accounts for about 0.6-1.0% of the total weight of the composition, and the preferred suitable range is 0.7-1.0%. If the amount is too small, the detergency of the oil will decrease, the base value will be low, and the service life of the lubricating oil will be shortened. If the amount is too large, the ash content of the lubricating oil will increase, the frequency of low-speed pre-ignition will increase, the effects of other functional additives will be affected, and there is no other beneficial effect.

[0014] According to the specific embodiments of the present application, preferably, the ashless dispersant comprises polyisobutylene succinimide, and more preferably high-nitrogen high-alkali high-molecular polyisobutylene succinimide with a nitrogen content of 1.8-2.2% and a base value of 46-55 mgKOH / g. The ashless dispersant is a surface active agent, mainly used to disperse the pollutants generated in the engine, so as to ensure that the oil can flow freely. The dispersibility of the ashless dispersant can help the engine to remain clean, and in some cases, help to maintain the cleanliness of the piston. Different types of dispersants have different effects on the dispersion of sludge and deposits, and high-alkali high-molecular dispersants generally have good dispersion effect on the deposits generated at high temperature, while dispersants with general molecular weight have better dispersion effect on the sludge generated at low temperature. The high-molecular polyisobutylene succinimide with high nitrogen content and base value selected in the present application can not only have better dispersion effect, but also assist in reducing the performance degradation of ZDDP, synergize the wear resistance effect of extreme pressure anti-wear agent, and increase the base value of the engine oil. The ashless dispersant accounts for about 6.0-10.0% of the total weight of the composition, and the preferred suitable range is 6.0-8.0%. If the amount is too small, the dispersion performance of the oil will decrease, the surface deposits of the engine parts will increase, and the sludge in the oil pan will be thick. If the amount is too large, the additives will be wasted, the effects of other functional additives in the lubricating oil will be affected, and there is no other beneficial effect.

[0015] According to the specific embodiment of the present application, preferably, the tackifier comprises ethylene propylene copolymer, such as RHY615, 9230F, etc. The performance of lubricating oil is closely related to the type and shear stability of tackifier, and the tackifier of the present application is preferably ethylene propylene copolymer with a shear index of 20. The amount of the tackifier of the present application is about 3.0-5.0% of the total weight of the composition. Too little amount will result in lower viscosity, and the thickness of oil film and stability will decrease, which will result in the decrease of the anti-wear performance of the oil in actual use. Too much amount will result in the waste of additives, and the viscosity of the oil will be too large, which will result in the decrease of the low-temperature performance and the detergency, and no other beneficial effects.

[0016] According to the specific embodiment of the present application, preferably, the pour point depressant comprises polymethacrylate. The addition of the pour point depressant will decrease the pour point of the lubricating oil, and improve the use effect of the oil in low-temperature environment. The amount of the pour point depressant is not particularly limited in the present application, and is usually 0.1-0.2% of the total weight of the lubricating oil composition. If the value is lower than 0.1%, the amount is too little, which will result in the pour point of the lubricating oil not meeting the standard requirements, and affecting the flowability in low-temperature environment.

[0017] According to the specific embodiment of the present application, preferably, the anti-foaming agent comprises dimethyl silicone oil. The anti-foaming agent can reduce the phenomenon of foam generation due to mechanical stirring in the actual use of the lubricating oil, and avoid the problem of the rupture of part of the oil film of the engine parts due to the generation of a large amount of foam in use. The amount of the anti-foaming agent is not particularly limited in the present application, and is usually 0.001-0.010% of the total weight of the lubricating oil composition. If the value is lower than 0.001%, the amount is too little, which will result in the decrease of the anti-foaming property. If the value is higher than 0.010%, the amount is too much, which will result in the waste of additives, and no other beneficial effects.

[0018] According to the specific embodiment of the present application, preferably, the CTL base oil is coal-derived synthetic oil with a kinematic viscosity of 3.8-4.2 mm 2 / s at 100°C, and more preferably 4 mm 2 / s.

[0019] According to the specific embodiment of the present application, preferably, the API Group III base oil is API Group III hydrocracking base oil with a kinematic viscosity of 3.8-4.3 mm 2 / s at 100°C, and more preferably 4 mm 2 / s.

[0020] According to the specific embodiment of the present application, preferably, the sulfur content of the lubricating oil composition is 0.20-0.30wt%, the phosphorus content is 0.06-0.07wt%, the base number is 9.0-11.0mgKOH / g, the sulfate ash content is 0.4-0.6wt%, the four-ball wear scar diameter of the lubricating oil composition after 120 hours durability test of M100 methanol engine according to NB / SH / T 0189 is below 0.8mm, and the methanol engine can be started within 3.5 seconds at -36℃.

[0021] According to the specific embodiment of the present application, preferably, the above-mentioned base oil is two high viscosity index base oil compositions whose performance meets the requirements of API Class III base oil standards.

[0022] The present application also provides the use of the above-mentioned lubricating oil composition in M100 methanol passenger car engine.

[0023] Based on the mechanism of additive action, the present application has solved the key technical problems through systematic and complex screening and optimization of different types of additives and different compositions of the same type of additives by means of various simulation tests, laboratory simulation tests and M100 methanol engine durability test, and through the introduction and adjustment of the type and proportion of additives, the synergistic effect between additives is improved, the anti-wear performance and low-temperature cold start performance are better than those of the existing commercial products, the lubricating requirements of M100 methanol engine are met, the anti-wear durability is more excellent in M100 methanol engine durability test, the low-temperature cold start performance in cold regions is better, and the low viscosity and long oil change period requirements of methanol engine oil are solved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 is a photo of the pressure surface of the piston;

[0025] Fig. 2 is a photo of the non-pressure surface of the piston;

[0026] Fig. 3 is a photo of the oil sump. DETAILED DESCRIPTION

[0027] In order to have a clearer understanding of the technical features, objects and beneficial effects of the present application, the technical solutions of the present application are described in detail below, but it should not be understood as a limitation on the scope of implementation of the present application.

[0028] In order to screen base oil and additive components, the present application uses PDSC (induction period), wear scar diameter, low temperature dynamic viscosity and other test methods in the laboratory to evaluate the oxidation stability, wear resistance and low temperature flowability of the oil product respectively. The simulated test conditions are: the PDSC oxidation induction period is set at 210°C, the template diameter is 392N, and the low temperature dynamic viscosity test temperature is -35°C.

[0029] Example 1

[0030] This example provides a lubricating oil composition, the raw materials used and their qualities are as follows:

[0031] Calcium salicylate with a basic value of 265-295 0.5 Kg;

[0032] Magnesium sulfonate with a basic value of 395-430 0.5 Kg;

[0033] High molecular polyisobutylene succinimide (basic value 46 mg KOH / g, nitrogen content 1.8%) 8.0 Kg;

[0034] Basic sulfur phosphorus double octyl octyl salt (sulfur phosphorus ratio 1.80, zinc phosphorus ratio 1.1) 0.9 Kg;

[0035] A mixture of p,p-diisooctyl diphenylamine and ester type hindered phenol (VANLUBE BHC) (mass ratio 1:1) 1.0 Kg;

[0036] A mixture of N,N-di(2-ethylhexyl)-methyl-1H-benzotriazole-1-methanamine and 2,5-dimercapto-1,3,4-thiadiazole (mass ratio 1:1) 1.8 Kg;

[0037] Dibenzyl disulfide anti-wear agent (sulfur content 14%) 0.8 Kg;

[0038] Ethyl propylene copolymer tackifier (RHY615) 4.0 Kg;

[0039] Polymethyl acrylate 0.2 Kg;

[0040] Dimethyl silicone oil antifoaming agent 0.005 Kg;

[0041] CTL base oil (100°C viscosity 3.8-4.2 mm 2 / s) 40.0 Kg;

[0042] API Class III hydrogenated base oil (100°C viscosity 3.8-4.3 mm 2 / s) 42.195 Kg;

[0043] The sulfur content of the lubricating oil composition of this example is 0.28%, and the phosphorus content is 0.067%.

[0044] Example 2:

[0045] This example provides a lubricating oil composition, the raw materials used for 100 Kg thereof and the quality thereof are as follows:

[0046] Calcium salicylate having a basic number of 320-360 0.5 Kg;

[0047] Alkyl magnesium salicylate having a basic number of 400 0.4 Kg;

[0048] High molecular polyisobutylene succinimide (basic number 48 mgKOH / g, nitrogen content 1.8%) 10.0 Kg;

[0049] Basic zinc dithiophosphate (sulfur: phosphorus ratio 1.9, zinc: phosphorus ratio 1.1) 1.0 Kg;

[0050] Mixture of p,p-diisooctyl diphenylamine and ester type hindered phenol (VANLUBE BHC) (mass ratio 1:1) 1.0 Kg;

[0051] Mixture of N,N-di(2-ethylhexyl)-methyl-1H-benzotriazole-1- methanamine and 2,5-dimercapto-1,3,4-thiadiazole (mass ratio 1:1) 2.0 Kg;

[0052] Dibenzyl disulfide antiwear agent (sulfur content 14%) 0.5 Kg;

[0053] Ethyl propyl copolymer tackifier (9230F) 4.0 Kg;

[0054] Polymethacrylate 0.2 Kg;

[0055] Dimethyl silicone oil antifoaming agent 0.005 Kg;

[0056] CTL base oil (100°C viscosity 3.8-4.2 mm 2 / s) 40.0 Kg;

[0057] API Group III hydrogenated base oil (100°C viscosity 3.8-4.3 mm 2 / s) 40.395 Kg;

[0058] The sulfur content of the lubricating oil composition of this example is 0.27%, and the phosphorus content is 0.070%.

[0059] Example 3:

[0060] This example provides a lubricating oil composition, the raw materials used for 100 Kg thereof and the quality thereof are as follows:

[0061] The alkali value 400 alkyl magnesium salicylate in Example 2 above is replaced with a sulfonic acid magnesium salt having an alkali value of 395-430, and the other components are the same in quality. The sulfur content of the lubricating oil composition of this example is 0.30%, and the phosphorus content is 0.068%.

[0062] Comparative Example 1

[0063] This comparative example provides a lubricating oil composition, the raw materials used for 100 kg and their quality are as follows:

[0064] The basic sulfur phosphorus bis-cetyl alkyl octyl salt in Example 1 above is replaced with a sulfur phosphorus ratio of 2.1 sulfur phosphorus secondary alkyl zinc salt, and the other components are the same in quality. The sulfur content of the lubricating oil composition of this comparative example is 0.35%, and the phosphorus content is 0.080%.

[0065] Comparative Example 2

[0066] This comparative example provides a lubricating oil composition, the raw materials used for 100 kg and their quality are as follows:

[0067] The basic sulfur phosphorus bis-cetyl alkyl octyl salt zinc dithiophosphate in Example 1 above is replaced with a sulfur phosphorus ratio of 2.1 sulfur phosphorus secondary alkyl zinc salt, and the high molecular polyisobutylene succinimide is replaced with a boronized succinimide dispersant having an alkali value of 16, and the other components are the same in quality. The sulfur content of the lubricating oil composition of this comparative example is 0.33%, and the phosphorus content is 0.081%.

[0068] Comparative Example 3

[0069] This comparative example provides a lubricating oil composition, the raw materials used for 100 kg and their quality are as follows:

[0070] The CTL base oil in Example 1 above is replaced with an API Class III hydrogenated base oil (100°C viscosity 5.8-6.2 mm 2 / s), and the other components are the same in quality. The sulfur content of the lubricating oil composition of this comparative example is 0.28%, and the phosphorus content is 0.070%.

[0071] To verify the effect of the present application, the engine lubricating oil prepared according to the examples of the present application was subjected to laboratory simulated performance evaluation and engine bench test, and the test results are shown in Table 1:

[0072] 1. Laboratory performance evaluation of lubricating oil composition

[0073] Table 1 Performance evaluation results of lubricating oil composition

[0074]

[0075] From the data in Table 1, it can be seen that the lubricating oil of the present application has good oxidation resistance and wear resistance in the PDSC oxidation induction period and the wear scar diameter simulation test evaluation. After 120 hours of M100 methanol engine durability test, the oil wear scar diameter is less than 0.8 mm, which is better than the wear scar diameter result of the commercially available methanol engine oil after 100 hours of durability test. In the low temperature dynamic viscosity test at -35℃, it shows excellent low temperature fluidity. Example 1 completed the low temperature cold start test of methanol automobile within 5s at outdoor temperature of -36℃, and achieved the use effect of starting within 3.5s. Because Comparative Example 1 and Comparative Example 2 did not use basic zinc dithiophosphate (basic sulfur phosphorus dicaprylyl octyl salt), although the oil PDSC performance is similar, the wear resistance of the oil after mixing with water, methanol and formic acid all decreased significantly, and in Comparative Example 2, without using high nitrogen, high base value and high molecular polyisobutylene succinimide, the wear test even appeared serious results of jamming. Comparative Example 3 did not use CTL4 base oil, which resulted in a significant decrease in low temperature fluidity of the oil, and could not achieve the excellent low temperature fluidity effect of the present application.

[0076] 2, Engine bench test after disassembly of the lubricating oil composition of Example 1

[0077] From the engine disassembly, it can be seen that Figs. 1-3 the lubricating oil composition of the present application showed excellent detergency, dispersion, and wear resistance in the methanol engine test.

Claims

1. An alcohol-resistant, low-viscosity lubricating oil composition, comprising, based on 100% of the total mass of the lubricating oil composition: 0.6-1.0% metal detergent, 6.0-10.0% ashless dispersant, 0.5-2.0% antioxidant and anti-wear agent, 1.0-2.0% metal deactivator, 0.2-1.0% extreme pressure anti-wear agent, 3.0-5.0% viscosity index modifier, 0.1-0.2% pour point depressant, 0.001-0.010% antifoaming agent, 30.0-50.0% CTL base oil, balance being API Group III base oil; The antioxidant and anti-wear agent includes basic zinc dithiophosphate, amine-based ashless antioxidant, and phenolic ashless antioxidant; the basic zinc dithiophosphate is a basic thiophosphate bis(octyl) octyl salt. The metal deactivators include thiadiazole-type metal deactivators and methylbenztriazole-type metal deactivators; The extreme pressure anti-wear agent includes a sulfide-type extreme pressure anti-wear agent; In the antioxidant and anti-wear agent, the sulfur-to-phosphorus ratio of the basic zinc dithiophosphate is: 1.8-1.9, zinc-phosphorus ratio is 1.1-1.2; In the extreme pressure anti-wear agent, the sulfur content of the sulfide-type extreme pressure anti-wear agent is 14.0-15.0%; The ashless dispersant includes polyisobutylene succinimide.

2. The lubricating oil composition according to claim 1, wherein, Based on the antioxidant and anti-wear agent being 100% by mass, the antioxidant and anti-wear agent comprises 40-60% basic zinc dithiophosphate, 20-30% amine-based ashless antioxidant, and 10-20% phenol-based ashless antioxidant. In the metal deactivator, the mass ratio of thiadiazole-type metal deactivator to methylbenztriazole-type metal deactivator is 1:2-2:

1.

3. The lubricating oil composition according to claim 1, wherein, The composition of the lubricating oil includes: 0.7-1.0% metal detergent, 6.0-8.0% ashless dispersant, 0.5-1.8% antioxidant and anti-wear agent, 1.0-2.0% metal deactivator, 0.2-0.8% extreme pressure anti-wear agent, 3.0-5.0% viscosity index depressant, 0.1-0.2% pour point depressant, 0.001-0.010% antifoaming agent, 30.0-40.0% CTL base oil, balance being API Group III base oil.

4. The lubricating oil composition according to claim 1, wherein, The metal cleaning agent includes calcium salts and magnesium salts.

5. The lubricating oil composition according to claim 4, wherein, The calcium salt includes calcium salicylate and / or calcium sulfonate, and the magnesium salt includes magnesium salicylate and / or magnesium sulfonate.

6. The lubricating oil composition according to claim 1, wherein, The polyisobutylene succinimide has a nitrogen content of 1.8-2.2% and an alkalinity of 46-55 mgKOH / g.

7. The lubricating oil composition according to claim 1, wherein, The adhesive includes an ethylene-propylene copolymer.

8. The lubricating oil composition according to claim 1, wherein, The pour point depressant includes polymethyl methacrylate.

9. The lubricating oil composition according to claim 1, wherein, The antifoaming agent includes dimethyl silicone oil.

10. The lubricating oil composition according to claim 1, wherein, The CTL base oil has a kinematic viscosity of 3.8-4.2 mm at 100°C. 2 / s of coal-derived synthetic oil.

11. The lubricating oil composition according to claim 1, wherein, The API Group III base oil has a kinematic viscosity of 3.8-4.3 mm at 100°C. 2 / s of API Group III hydrocracking base oil.

12. The lubricating oil composition according to claim 1, wherein, The lubricating oil composition has a sulfur content of 0.20-0.30 wt%, a phosphorus content of 0.06-0.07 wt%, an alkalinity of 9.0-11.0 mgKOH / g, and a sulfate ash content of 0.4-0.6 wt%. After a 120-hour durability test of the M100 methanol engine according to NB / SH / T 0189, the diameter of the four-ball wear scar of the lubricating oil composition is less than 0.8 mm, and the methanol engine can be started within 3.5 seconds at -36℃.

13. The use of the lubricating oil composition according to any one of claims 1-12 in an M100 methanol passenger car engine.

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