Diesel engine oil composition and method of making same

Abstract

The present application provides a diesel engine oil composition, which comprises an aromatic amine type dispersant, an antioxidant, a metal detergent, zinc dialkyldithiophosphate, ashless friction modifier and lubricating oil base oil, wherein the structure of the aromatic amine type dispersant is shown as formula (I): wherein the definitions of the groups are described in the specification. The diesel engine oil composition of the present application has excellent cleaning, dispersing and antioxidant properties, and can greatly reduce the addition amount of the cleaning agent and the antioxidant in the composition, and can meet the requirements of CH-4, CI-4 and CK-4 and above standard diesel engine oil.

Description

TECHNICAL FIELD

[0001] The present application relates to a diesel engine oil composition, in particular to a diesel engine oil composition with excellent dispersing, detergency and antioxidant properties and a preparation method thereof. BACKGROUND

[0002] The unsaturated olefins, aromatic hydrocarbons and a small amount of sulfur compounds in the lubricating oil base oil are extremely easy to react with oxygen to generate gum, and eventually form carbon deposits, especially in the key components such as intake valve, piston, oil pan, combustion chamber, etc. which can accelerate the formation of engine deposits, seriously affecting the working performance of the engine, resulting in difficult engine starting, unstable idling, poor driving performance, poor acceleration, serious power loss and other problems. Carbon deposits make the transmission gear rotate poorly, increase the wear resistance of the gear, shorten the service life of the gear box, and generate unnecessary expensive maintenance costs.

[0003] The detergency and dispersing properties of engine oil have always been an important indicator in oil product specifications. For example, the specification grade of diesel engine oil is constantly upgraded with the requirements of diesel engine structure, operating conditions and energy saving and emission reduction, and its product specifications are upgraded from CF-4 to CH-4, CI-4 and the latest CK-4. With the application of EGR exhaust gas recirculation system of diesel engine, the NOx emission is reduced, and the amount of soot in the lubricating oil is increased. The proportion of carbon black in the diesel engine oil in use is gradually increased from 2% in CF-4 grade to 6.7% in CK-4 grade, which puts higher requirements on the detergency and dispersing properties of the oil product.

[0004] However, the diesel engine oil composition manufactured using the detergency and dispersing agents of the prior art cannot fully meet the requirements of such higher specification products. Therefore, the prior art still needs a diesel engine oil composition which not only can meet the increasingly stringent requirements of higher specification products on detergency and dispersing properties, but also has excellent antioxidant properties. SUMMARY

[0005] The present application provides a diesel engine oil composition which not only can meet the increasingly stringent requirements of higher specification products on detergency and dispersing properties, but also can significantly reduce the addition amount of detergents and antioxidants.

[0006] The diesel engine oil composition of the present application comprises an aromatic amine type dispersant, an antioxidant, a metal detergent, zinc dialkyldithiophosphate, an ashless friction modifier and a lubricating oil base oil, wherein the structure of the aromatic amine type dispersant is shown as formula (I):

[0007]

[0008] In formula (I), each R0 group is the same or different from each other, and each is independently selected from H, C1-C4 alkyl, C6-C10 aryl, C7-C12 alkylaryl and C7-C12 aralkyl. 10aryl; each of the G groups is the same as or different from one another, and each is independently selected from the group consisting of H, C1-C4 alkyl, C6-C10 aryl, and a group represented by formula (II); 10 aryl, a group represented by formula (II), and at least one G group is selected from a group represented by formula (II);

[0009]

[0010] In formula (II), the R group is selected from a polyisobutylene group having a number average molecular weight of 1000 to 5000, and the symbol * represents a binding end to formula (I).

[0011] According to the present application, in formula (I), each of the R0 groups is independently selected from the group consisting of H, C1-C4 alkyl, and phenyl; each of the G groups is independently selected from the group consisting of H, C1-C4 alkyl, phenyl, and a group represented by formula (II); and in formula (II), the R group is selected from a polyisobutylene group having a number average molecular weight of 1000 to 2500.

[0012] According to the present application, in formula (I), one, two, or three G groups are independently selected from a group represented by formula (II).

[0013] According to the present application, examples of the aromatic amine type dispersant include one or more of the following structural compounds:

[0014]

[0015] wherein PIB represents a polyisobutylene group.

[0016] According to the present application, the method for producing the aromatic amine type dispersant includes the following steps:

[0017] (1) reacting a compound represented by formula (a) with isatoic anhydride;

[0018]

[0019] In formula (a), each of the R0 groups is the same as or different from one another, and each is independently selected from the group consisting of H, C1-C4 alkyl, C6-C10 aryl, and a group represented by formula (II); 10 aryl; each of the G groups is the same as or different from one another, and each is independently selected from the group consisting of H, C1-C4 alkyl, C6-C 10 aryl, and at least one G group is selected from H;

[0020] (2) reacting the reaction product of step (1) with a polyisobutylene maleic anhydride, and collecting the product.

[0021] According to the present application, in formula (a), each of the R0 groups is independently selected from the group consisting of H, C1-C4 alkyl, and phenyl; and each of the G' groups is independently selected from the group consisting of H, C1-C4 alkyl, and phenyl.

[0022] According to the present application, in formula (a), one, two or three G' groups are selected from H.

[0023] According to the present application, the compound of formula (a) can be tris(4- aminophenyl)amine.

[0024] According to the present application, the isatoic anhydride has the following structure:

[0025]

[0026] According to the present application, the polyisobutylene maleic anhydride has the following structure:

[0027]

[0028] wherein the PIB group is selected from a polyisobutylene group having a number average molecular weight of 1000-5000, preferably from a polyisobutylene group having a number average molecular weight of 1000-2500.

[0029] According to the present application, optionally, in step (1), the molar ratio of the compound of formula (a) to isatoic anhydride is 1:(0.5-3.5), preferably 1:(3-3.2); the reaction conditions include: the reaction temperature is 80-100℃, and the reaction time is 8-12h; preferably, the reaction temperature is 85-95℃, and the reaction time is 9-10h.

[0030] According to the present application, optionally, in step (2), the molar ratio of the reaction product of step (1) to polyisobutylene maleic anhydride is 1:(0.5-3.5), preferably 1:(3-3.2); the reaction conditions include: the reaction temperature is 140-160℃, and the reaction time is 4-8h; preferably, the reaction temperature is 145-155℃, and the reaction time is 5-7h.

[0031] According to the present application, steps (1) and (2) can be carried out in the presence of a diluent and / or a solvent, or can be carried out without using a diluent and / or a solvent.

[0032] According to the present application, the diluent can be selected from one or more of API I, II, III, IV and V base oils, and common commercial products or brands include 100SN, 150SN, 200SN, 350SN, 500SN, 650SN, 150BS, HVI-100, HVI-150, HVI-200, HVI-350, HVI-400, HVI-500, HVI-150BS, PAO4, PAO6, PAO8, PAO10, alkylbenzene, alkylnaphthalene, etc.

[0033] According to the present application, the solvent can be selected from C 6-20aromatic hydrocarbons (such as benzene, toluene, xylene and cumene), C 6-10 alkanes (such as n-hexane, cyclohexane and petroleum ether), solvent naphtha and the like. These solvents can be used singly or in combination of two or more. The solvent can be removed after the reaction is completed by distillation under normal or reduced pressure, using a method known to those skilled in the art.

[0034] According to a particular embodiment of the present application, the diluent and / or solvent can be added at any stage of the reaction step in an amount according to the routine use in the art, without particular limitation.

[0035] According to the present application, the reactions of steps (1) and (2) can be carried out under the protection of an inert gas atmosphere. As the inert gas, for example, nitrogen and argon and the like can be mentioned, without particular limitation.

[0036] According to the present application, by the aforementioned production method, as the reaction product, a single aromatic amine type dispersant can be produced, or a mixture of a plurality of aromatic amine type dispersants can be produced, or a mixture of one or more aromatic amine type dispersants and the aforementioned diluent (if used) can be produced. These reaction products are all intended by the present application, and the difference in the form of existence does not affect the realization of the effect of the present application. Therefore, these reaction products are collectively referred to as aromatic amine type dispersants without distinction in the context of the present specification. In view of this, according to the present application, there is no absolute necessity to further purify the reaction product, or to further separate a specific structure of the aromatic amine type dispersant from the reaction product. Of course, the purification or separation is preferred for further improvement of the intended effect of the present application, but is not essential to the present application. Nevertheless, as the purification or separation method, for example, purification or separation of the reaction product by column chromatography or preparative chromatography and the like can be mentioned.

[0037] According to the present application, the polar end of the aromatic amine type dispersant contains a plurality of benzene rings and amide functional groups centered on the N atom, which matches the fused ring aromatic hydrocarbon structure of soot better, and has excellent dispersing performance; the aromatic amine type dispersant not only can effectively disperse soot, but also can control the viscosity increase caused by oil during use. The production method of the aromatic amine type dispersant according to the present application is simple in process and high in synthesis efficiency.

[0038] According to the present application, the antioxidant can be selected from phenolic antioxidants and / or alkylated diphenylamine. The phenolic antioxidant can be selected from one or more of 2,6-di-tert-butyl-alpha-dimethylaminoparacresol, 2,6-di-tert-butyl-paracresol, hydroquinone and 4,4-methylenebis(2,6-di-tert-butylphenol).

[0039] According to the present application, the metal detergent can be selected from sulfonates and / or sulfurized alkyl phenates, preferably selected from the group consisting of magnesium sulfonate and calcium sulfide alkyl phenate mixture, the mass ratio between the two is preferably 1:1~2.

[0040] According to the present application, the alkyl group in the zinc dialkyldithiophosphate can be selected from C2~C 12 alkyl, preferably selected from C3~C8alkyl, which can be selected from one or more of ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, n-pentyl, isopentyl, n-hexyl, isohexyl, n-octyl and 2-ethylhexyl.

[0041] According to the present application, the ashless friction modifier can be selected from fatty acid polyol esters. The fatty acid polyol esters include monoester, diester or polyesters of fatty acid glycerol ester, fatty acid pentaerythritol ester, fatty acid ethylene glycol ester, fatty acid succinic acid ester, fatty acid ethanolamine ester, fatty acid diethanolamine ester, fatty acid triethanolamine ester and the like, such as oleic acid monoglyceride, oleic acid diglyceride, stearic acid monopentaerythritol ester, ethylene glycol dilaurylate, oleic acid monoglyceride, oleic acid diethanolamine, oleic acid triethanolamine and the like.

[0042] According to the present application, the lubricating oil base oil can be selected from one or more of API I, II, III, IV, V type lubricating oil base oil, such as can be selected from one or more of mineral lubricating oil and synthetic lubricating oil. Common commercial brand of the mineral lubricating oil base oil includes I type 100SN, 150SN, 600SN, II type 100N, 150N and the like. The synthetic lubricating oil base oil includes polymeric hydrocarbon oil and / or ester oil. Specific examples of the polymeric hydrocarbon oil include polybutene, polypropylene, propylene-isobutylene copolymer, chlorinated polybutene, poly(1-hexene), poly(1-octene), poly(1-decene), common commercial brand includes PAO4, PAO6, PAO8, PAO10 and the like. Specific examples of the ester oil include but are not limited to dibutyl adipate, di(2-ethylhexyl)sebacate, di-n-hexyl fumarate, dioctyl sebacate, diisooctyl azelate, diisodecyl azelate, dioctyl phthalate, didecyl phthalate, di(eicosyl)sebacate, 2-ethylhexyl diester of linoleic acid dimer. The lubricating oil base oil can be selected from lubricating oil base oil with viscosity index greater than 80, saturated hydrocarbon mass fraction greater than 90%, and sulfur content mass fraction less than 0.03%.

[0043] According to the present application, the aromatic amine dispersant accounts for 0.1% to 20% (preferably 0.2% to 16%, more preferably 0.5% to 10%) of the total mass of the diesel engine oil composition; the antioxidant accounts for 0.01% to 5% (preferably 0.03% to 3%, more preferably 0.05% to 2%) of the total mass of the diesel engine oil composition; the metal detergent accounts for 0.2% to 20% (preferably 0.8% to 15%, more preferably 1.2% to 8%) of the total mass of the diesel engine oil composition; the zinc dialkyldithiophosphate accounts for 0.1% to 10% (preferably 0.2% to 8%, more preferably 0.5% to 5%) of the total mass of the diesel engine oil composition; the ashless friction modifier accounts for 0.01% to 5% (preferably 0.02% to 4%, more preferably 0.05% to 3%) of the total mass of the diesel engine oil composition; and the lubricating oil base oil constitutes the main component of the diesel engine oil composition.

[0044] The method for manufacturing the diesel engine oil composition of the present application comprises the step of mixing the aromatic amine dispersant, the antioxidant, the metal detergent, the zinc dialkyldithiophosphate, the ashless friction modifier, and the lubricating oil base oil.

[0045] The diesel engine oil composition of the present application has excellent detergency, dispersancy, and antioxidant properties, while the additive amount of the detergent and the antioxidant in the composition can be greatly reduced, and the requirements of CH-4, CI-4, and CK-4 and above specifications of diesel engine oil can be met. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 is the infrared spectrum of the aromatic amine dispersant prepared in Example 1 of the present application.

[0047] Figure 2 is the infrared spectrum of the intermediate product prepared in Example 1 of the present application. DETAILED DESCRIPTION

[0048] The present application is further illustrated by the following examples, but is not limited thereto.

[0049] The main raw materials used are as follows:

[0050] Polyisobutylene succinimide (PIB number average molecular weight 1000), Yangzi Petrochemical;

[0051] Polyisobutylene maleic anhydride (PIB number average molecular weight 1000), Yangzi Petrochemical;

[0052] 100SN, 150SN, Maoming Petrochemical;

[0053] Indigo anhydride, Fangzhou Pharmaceutical Company;

[0054] Tris(4-aminophenyl)amine, Shanghai Adamas Reagent Co., Ltd.;

[0055] Antioxidant 2,6-di-tert-butyl-alpha-dimethylamino-p-cresol, marked as KY-1, Beijing Coupling Science and Technology Company;

[0056] Detergent, low-alkali-value sulfated alkyl phenol calcium, high-alkali-value sulfonated magnesium, both from the Additive Factory of Jinzhou Petrochemical Branch;

[0057] Zinc dialkyldithiophosphate, butyl, 2-ethylhexyl dithiophosphate zinc, marked as ZDDP-1, Wuxi South Petroleum Additive Co., Ltd.

[0058] Ashless friction modifier, glycerol monooleate, Additive Factory of Jinzhou Petrochemical Branch.

[0059] Example 1

[0060] In a 500ml reaction kettle, 4.89g of indigo anhydride and 2.9g of tris(4-aminophenyl)amine were added, 160ml of toluene was added, nitrogen was passed, water reflux was started, and reaction was carried out at 90℃ for 10 hours. After the reaction was completed, the toluene was evaporated. Then 33g of polyisobutylene maleic anhydride (the number average molecular weight of the polyisobutylene was 1000) dissolved in 100ml of 150SN was added, nitrogen was passed, water was started, and reaction was carried out at 150℃ for 6h. After the reaction was completed, the solvent was evaporated, and the arylamine dispersant of the application was obtained. The arylamine dispersant and the intermediate product obtained were respectively subjected to infrared spectrum test, the test method was as follows: the Fourier infrared spectrometer was AVATAR360 of American NICOLET Company, the scanning range was 4000-400cm -1 . Figure 1 is the infrared spectrum of the arylamine dispersant, Figure 2 is the infrared spectrum of the intermediate product.

[0061] From Figure 1 and Figure 2 it can be seen that the absorption peak of the primary amine connected with the benzene ring in the intermediate product is at 3349cm -1 nearby, and after the reaction with the polyisobutylene maleimide, the absorption peak disappears; the absorption peak of the amide in the intermediate product is at 1600cm -1 nearby, and after the reaction with the polyisobutylene maleimide, the absorption peak becomes weak; the absorption peak of the newly formed imide in the product is at 1700cm -1 nearby. Figure 1 and Figure 2 can indicate that the target product is prepared.

[0062] The example reaction formula of Example 1 is shown as follows.

[0063]

[0064] Example 2

[0065] In a 500ml reaction kettle, 4.89g of isatoic anhydride and 2.9g of tris(4- aminophenyl)amine were added, 160ml of toluene was added, nitrogen was introduced, and water reflux was started. The reaction was carried out at 80°C for 12 hours. After the reaction was completed, the toluene was evaporated. Then 33g of polyisobutylene maleic anhydride (the number average molecular weight of the polyisobutylene was 1000) dissolved in 100ml of 150SN was added, nitrogen was introduced, and water reflux was started. The reaction was carried out at 160°C for 5 hours. After the reaction was completed, the solvent was evaporated to obtain the arylamine type dispersant of the present application.

[0066] Example 3

[0067] In a 500ml reaction kettle, 4.89g of isatoic anhydride and 2.9g of tris(4- aminophenyl)amine were added, 160ml of toluene was added, nitrogen was introduced, and water reflux was started. The reaction was carried out at 80°C for 12 hours. After the reaction was completed, the toluene was evaporated. Then 33g of polyisobutylene maleic anhydride (the number average molecular weight of the polyisobutylene was 1000) dissolved in 100ml of 150SN was added, nitrogen was introduced, and water reflux was started. The reaction was carried out at 160°C for 5 hours. After the reaction was completed, the solvent was evaporated to obtain the arylamine type dispersant of the present application.

[0068] Comparative Example 1

[0069] The method of Example 1 was used, except that isatoic anhydride was not added, and tris(4-aminophenyl)amine was reacted with polyisobutylene maleic anhydride at a molar ratio of 1:3. After the reaction was completed, soot ashless dispersant DF1 of the present comparative example was obtained.

[0070] Comparative Example 2

[0071] The method of Example 1 was used, except that tris(4-aminophenyl)amine was replaced with an equimolar amount of diamino diphenyl methane to react, and soot ashless dispersant DF2 of the present comparative example was obtained.

[0072] Comparative Example 3

[0073] The method of Example 1 was used, except that only polyisobutylene maleimide was used instead of polyisobutylene maleic anhydride to synthesize polyisobutylene maleimide type ashless dispersant, and the number average molecular weight of the polyisobutylene in the polyisobutylene maleimide was 1000. Soot ashless dispersant DF3 of the present comparative example was obtained.

[0074] Comparative Example 4

[0075] Commercially available polyisobutylene succinimide T151 was used as a comparative ashless dispersant.

[0076] Examples 4-6 and Comparative Example 1 of Diesel Engine Oil Composition

[0077] The formulation components of Examples 4-6 and Comparative Example 1 were added to a blending vessel in the proportions shown in Table 1, heated to 60°C and stirred for 2 hours to produce the diesel engine oil compositions of Examples 4-6 and Comparative Example 1.

[0078] The lubricating oil compositions of the Examples or Comparative Examples were tested as test samples for their detergency by a coke formation simulation test of an engine crankcase. The test method was as follows: 300 ml of the test sample was added to a coke formation simulation tester, heated to 120°C, and sprayed onto an aluminum plate at 300°C in a continuous manner. The amount of coke formed on the aluminum plate after 320 minutes was measured to simulate the deposits on a piston. The higher the amount of coke, the worse the detergency of the test sample. The results of the coke formation test are shown in Table 1.

[0079] The lubricating oil compositions of the Examples or Comparative Examples were tested as test samples for their thermal oxidation stability by a pressurized differential scanning calorimetry test (PDSC). The test results were expressed in terms of the oxidation induction period of the test sample (in minutes). The PDSC test was performed at a temperature of 210°C, a pressure of 0.5 MPa, and an oxygen flow rate of 100 mL / min. The results of the PDSC test are shown in Table 1.

[0080] The lubricating oil compositions of the Examples or Comparative Examples were tested as test samples for their soot dispersancy by mixing the oil with 4% carbon black using a high-speed emulsifier, measuring the viscosity of the mixture, and calculating the viscosity increase rate of the oil. The lower the viscosity increase rate, the better the soot dispersancy of the oil. The results of the dispersancy simulation test are shown in Table 1.

[0081] Table 1

[0082]

[0083] As shown in Table 1, the diesel engine oil compositions of the present application have excellent detergency, dispersancy, and oxidation resistance.

Claims

1. A diesel engine oil composition comprising an aromatic amine type dispersant, an antioxidant, a metal detergent, a zinc dialkyldithiophosphate, an ashless friction modifier and a lubricating oil base oil, wherein the aromatic amine type dispersant has a structure represented by formula (I): ###0001### (I) in which each R0 group is selected from H; each G group is the same as or different from each other and is independently selected from H, a group represented by formula (II), and at least one G group is selected from a group represented by formula (II); ###0002### (II) in which R is selected from a polyisobutylene group having a number average molecular weight of 1000 to 5000, and the symbol * represents a bonding site to formula (I); and in which the aromatic amine type dispersant is present in an amount of 0.1 to 20% by mass of the total diesel engine oil composition; the antioxidant is present in an amount of 0.01 to 5% by mass of the total diesel engine oil composition; the metal detergent is present in an amount of 0.2 to 20% by mass of the total diesel engine oil composition; the zinc dialkyldithiophosphate is present in an amount of 0.1 to 10% by mass of the total diesel engine oil composition; the ashless friction modifier is present in an amount of 0.01 to 5% by mass of the total diesel engine oil composition; and the lubricating oil base oil constitutes the main component of the diesel engine oil composition. （I）， 2. The aromatic amine type dispersant of claim 1, wherein in formula (I), each R0 group is selected from H; each G group is the same as or different from each other and is independently selected from H, a group represented by formula (II), and at least one G group is selected from a group represented by formula (II); and in formula (II), R is selected from a polyisobutylene group having a number average molecular weight of 1000 to 2500. (I), (II), 3. The aromatic amine type dispersant of claim 1, wherein the aromatic amine type dispersant is one or more of the following compounds: ###0003### ###0004### ###0005### ###0006### ###0007### ###0008### ###0009### ###0010### ###0011### ###0012### ###0013### ###0014### ###0015### ###0016### ###0017### ###0018### ###0019### ###0020### ###0021### ###0022### ###0023### ###0024### ###0025### ###0026### ###0027### ###0028### ###0029### ###0030### ###0031### ###0032### ###0033### ###0034### ###0035### ###0036### ###0037### ###0038### ###0039### ###0040### ###0041### ###0042### ###0043### ###0044### ###0045### ###0046### ###0047### ###0048### ###0049### ###0050### ###0051### ###0052### ###0053### ###0054### ###0055### ###0056### ###0057### ###0058### ###0059### ###0060### ###0061### ###0062### ###0063### ###0064### ###0065### ###0066### ###0067### ###0068### ###0069### ###0070### ###0071### ###0072### ###0073### ###0074### ###0075### ###0076### ###0077### ###0078### ###0079### ###0080### ###0081### ###0082### ###0083### ###0084### ###0085### ###0086### ###0087### ###0088### ###0089### ###0090### ###0091### ###0092### ###0093### ###0094### ###0095### ###0096### ###0097### ###0098### ###0099### ###0100### ###0101### ###0102### ###0103### ###0104### ###0105### ###0106### ###0107### ###0108### ###0109### ###0110### ###0111### ###0112### ###0113### ###0114### ###0115### ###0116### ###0117### ###0118### ###0119### ###0120### ###0121### ###0122### ###0123### ###0124### ###0125### ###0126### ###0127### ###0128### ###0129### ###0130### ###0131### ###0132### ###0133### ###0134### ###0135### ###0136### ###0137### ###0138### ###0139### ###0140### ###0141### ###0142### ###0143### ###0144### ###0145### ###0146### ###0147### ###0148### ###0149### ###0150### ###0151### ###0152### ###0153### ###0154### ###0155### ###0156### ###0157### ###0158### ###0159### ###0160### ###0161### ###0162### ###0163### ###0164### ###0165### ###0166### ###0167### ###0168### ###0169### ###0170### ###0171### ###0172### ###0173### ###0174### ###0175### ###0176### ###0177### ###0178### ###0179### ###0180### ###0181### ###0182### ###0183### ###0184### ###0185### ###0186### ###0187### ###0188### ###0189### ###0190### ###0191### ###0192### ###0193### ###0194### ###0195### ###0196### ###0197### ###0198### ###0199### ###0200### ###0201### ###0202### ###0203### ###0204### ###0205### ###0206### ###0207### ###0208### ###0209### ###0210### ###0211### ###0212### ###0213### ###0214### ###0215### ###0216### ###0217### ###0218### ###0219### ###0220### ###0221### ###0222### ###0223### ###0224### ###0225### ###0226### ###0227### ###0228### ###0229### ###0230### ###0231### ###0232### ###0233### ###0234### ###0235### ###0236### ###0237### ###0238### ###0239### ###0240### ###0241### ###0242### ###0243### ###0244### ###0245### ###0246### ###0247### ###0248### ###0249### ###0250### ###0251### ###0252### ###0253### ###0254### ###0255### ###0256### ###0257### ###0258### ###0259### ###0260### ###0261### ###0262### ###0263### ###0264### ###0265### ###0266### ###0267### ###0268### ###0269### ###0270### ###0271### ###0272### ###0273### ###0274### ###0275### ###0276### ###0277### ###0278### ###0279### ###0280### ###0281### ###0282### ###0283### The antioxidant is selected from a phenolic antioxidant and / or an alkylated diphenylamine; the metal detergent is selected from a sulfonate and / or a sulfurized alkyl phenate; the alkyl groups in the zinc dialkyldithiophosphate are selected from C2-C 12 alkyl; the ashless friction modifier is selected from a fatty acid polyol ester; the lubricating oil base oil is selected from one or more of API Group I, II, III, IV, V lubricating oil base oils.

2. The diesel engine oil composition according to Claim 1, characterized in that, ​ 3. The diesel engine oil composition according to Claim 1, characterized in that, ​ , , , ​ 4. The diesel engine oil composition according to Claim 1, characterized in that, ​ ​ （α）， ​ ​ 5. The diesel engine oil composition according to Claim 4, characterized in that, ​ ， ​ 6. The diesel engine oil composition according to Claim 4, characterized in that, ​ 7. The diesel engine oil composition according to Claim 4, characterized in that, ​ 8. The diesel engine oil composition according to any one of claims 1 to 7, characterized in that, ​ ​

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