Manual transmission oil additive composition and application thereof

Abstract

The invention discloses a manual transmission oil additive composition, which specifically comprises 5 to 20 parts of an antioxidant and anti-wear multifunctional additive; 1.5 to 10 parts of a sulfur-containing extreme pressure agent; 20 to 40 parts of an anti-wear dispersant; 30 to 50 parts of a high-temperature detergent; 5 to 15 parts of a high-temperature antioxidant; and 3.5 to 20 parts of a friction modifier. The invention also discloses an application of the manual transmission oil additive composition, which can be used to prepare manual transmission oils of viscosity levels of 75W-80, 75W-85, and 75W-90; and is also suitable for lubrication of manual transmissions or manual-automatic transmissions of passenger cars and commercial vehicles containing synchronizers made of brass, bronze, molybdenum spraying, or carbon fiber. The manual transmission oil additive composition of the invention has a low additive amount, good synchronizer durability, thermal oxidation stability, pitting resistance, corrosion resistance, and friction characteristics, and is particularly excellent in anti-wear performance, thereby providing good protection for a manual transmission power output shaft and gears.

Description

Technical Field

[0001] The present invention belongs to the technical field of lubricating oil and lubricating oil additives, and in particular relates to a manual transmission oil additive composition.

[0002] The invention also relates to the use of the manual transmission oil additive composition. Background Art

[0003] Manual transmissions are entirely composed of gear transmission structures. The power is output by the engine, and the change in transmitted torque is completed during the meshing process of the clutch and the gear. From the perspective of its hardware structure and operation process, it has two key requirements for oil lubrication: First, to ensure that the gear structure will not be worn during the meshing process; second, to ensure stable torque transmission during the gear synchronization process. Therefore, manual transmission oils require excellent extreme pressure wear resistance and synchronizer durability. In addition, in order to ensure the long-term working stability of the transmission, the oil also needs to have excellent antioxidant properties, shear stability and anti-corrosion properties. For many years, there has been no unified standard for manual transmission oil, and API GL-4 oil has been widely used. In actual use, sludge, paint film and sediment have appeared in the transmission, leading to problems such as seal leakage and synchronizer lubrication failure. It is necessary to improve its synchronization performance, thermal oxidation stability, and adaptability to sealing materials.

[0004] CN106479653B reports a manual transmission oil for light vehicles and a preparation method thereof, wherein the base oil is a composite of a mineral base oil and a synthetic base oil in a mass ratio of 4:1. The metal passivator is a mixture of clay and an alkaline compound in a mass ratio of 3:1; the cleaning dispersant is a mixture of one of alkyl salicylate and cyclohexane salt and ashless phosphate in a mass ratio of 4:1. CN103374452A reports a manual transmission lubricating oil composition that meets the vehicle gear oil viscosity level of 75W / 80 or 75W / 85, and has excellent high and low temperature performance, corrosion resistance, rust resistance, and shear resistance, especially excellent synchronizer friction performance. CN105602691A reports an energy-saving manual transmission oil and a preparation method thereof, wherein the base oil uses dinonyl sebacate, dibutyl sebacate, etc. Currently, there are some manual transmission fluids on the market, but the viscosity levels covered by publicly reported literature are concentrated in 75W / 80 and 75W-85, most of which use synthetic base oils and are mainly suitable for the lubrication of light vehicle transmissions;

[0005] Compared with the prior art, the additive composition of the present invention is added to a mineral or synthetic base oil at 5.85wt% to prepare a manual transmission oil with a viscosity grade of 75W-80, 75W-85, and 75W-90. The manual transmission oil additive composition of the present invention has a low dosage, good synchronizer durability, thermal oxidation stability, corrosion resistance, and friction characteristics, especially excellent anti-wear performance, and provides good protection for the manual transmission power output shaft and gears. The manual transmission oil prepared by the composition of the present invention is suitable for the lubrication of manual transmissions (MT) or automatic manual transmissions (AMT) of passenger cars and commercial vehicles containing synchronizers made of brass, bronze, molybdenum spraying, carbon fiber, etc., and can meet the lubrication requirements of both light vehicle transmissions and heavy vehicle transmissions. Summary of the invention

[0006] The object of the present invention is to provide a manual transmission oil additive composition, which achieves the purpose of reducing the additive amount by using a series of multifunctional additives.

[0007] In order to achieve the above-mentioned purpose, the performance of each component in the additive composition was carefully studied, mainly focusing on the anti-wear performance of the composition and the durability of the synchronizer. At the same time, with the thermal oxidation stability, corrosion resistance and friction characteristics as the goal, the synergistic effect between the additives was investigated; in order to investigate the components, proportions and performance of each additive, the present invention adopted the following test methods for simulation evaluation, GB / T 5906 "Petroleum Products Copper Strip Corrosion Test Method", GB / T3142 "Lubricating Oil Extreme Pressure Performance Determination Method", NB / SH / T0189 "Lubricating Oil Anti-wear Performance Determination Method", SH / T 0059 "Lubricating Oil Evaporation Loss Determination Method Noack Method", NB / SH / T 0847 "Extreme Pressure Lubricating Oil Friction and Wear Determination SRV Testing Machine Method", SH / T0209 "Lubricating Oil Thermal Stability Determination Method", SH / T 0755 "Evaluation Method for Thermal Oxidation Stability of Manual Transmission Oil and Rear Axle Oil (L-60-1 Method)", in order to evaluate the performance of lubricating oil compositions, the FZG gear machine test and NB / SH / T 0925 "Evaluation of Synchronous Mesh Durability of Manual Transmission Oil FZG SSP-180 Method" were used for testing.

[0008] The technical solution adopted by the present invention is that the manual transmission oil additive composition specifically includes: antioxidant and anti-wear multifunctional additive: 5 to 20 parts; sulfur-containing extreme pressure agent: 1.5 to 10 parts; anti-wear dispersant: 20 to 40 parts; high-temperature detergent: 30 to 50 parts; high-temperature antioxidant: 5 to 15 parts; friction modifier: 3.5 to 20 parts.

[0009] The present invention is also characterized in that:

[0010] The anti-oxidation and anti-wear multifunctional additive is a mixture of one or more of dialkyl dithiophosphate zinc salt, diamyl dithiocarbamate amine and diamyl dithiocarbamate copper; preferably, the weight proportion of the anti-oxidation and anti-wear multifunctional additive is 5 to 15 parts;

[0011] The dialkyl dithiophosphate zinc salt is one or more of di(2-ethylhexyl) dithiophosphate zinc basic salt, di(4-methyl-2-pentyl) dithiophosphate zinc basic salt, di(2-ethylhexyl) arylamino dithiophosphate zinc, and di(4-methyl-2-pentyl) arylamino dithiophosphate zinc;

[0012] The sulfur-containing extreme pressure agent is cyclohexanecarboxylic acid alkyl ester polysulfide, and preferably, the weight proportion of the sulfur-containing extreme pressure agent is 1.5 to 5 parts;

[0013] The structure of cyclohexanecarboxylic acid alkyl ester polysulfide is:

[0014]

[0015] In the formula, m is a positive integer of 1 to 4, preferably, m is 2 or 3, R1 is a linear or branched C1 to C10 hydrocarbon group, preferably, R1 is a linear or branched C3 to C6 hydrocarbon group;

[0016] The anti-wear dispersant is a polymer succinimide containing aromatic amine groups, a polymer succinimide containing molybdenum, or a mixture of any combination of the two; preferably, the weight portion of the anti-wear dispersant is 25 to 40 parts;

[0017] The structure of the polymer succinimide containing aromatic amine groups is:

[0018]

[0019] Wherein, PIB is polyisobutylene having a molecular weight of 1500 to 2500, R2 is a hydrogen atom or a methyl group or a methoxy group, preferably a hydrogen atom;

[0020] The high temperature detergent is a mixture of an ultra-high base magnesium sulfonate with a TBN greater than 400 and a sulfurized alkylphenol calcium salt with a TBN of 200, wherein the mass ratio of the magnesium sulfonate to the sulfurized alkylphenol calcium salt is 1 to 4:1, and the preferred ratio is 1 to 2:1; preferably, the weight portion of the high temperature detergent is 30 to 40 parts;

[0021] The super high basicity magnesium sulfonate with TBN greater than 400 is prepared by phase transformation using 80wt% linear heavy alkylbenzene sulfonic acid and 20wt% C11-C14 long chain sulfonic acid as raw materials; the alkyl phenate calcium sulfide with TBN of 200 is compounded by high basicity alkyl phenate calcium sulfide dimer, alkyl phenate calcium sulfide trimer, alkyl phenate calcium sulfide tetramer with TBN of 250 and low basicity alkyl phenate calcium sulfide with TBN of 130;

[0022] The high temperature antioxidant is a 3-(3,5-di-tert-butyl-4-hydroxyphenol) propionic acid alkyl alcohol ester antioxidant; preferably, the weight proportion of the high temperature antioxidant is 5 to 10 parts;

[0023] The structure of 3-(3,5-di-tert-butyl-4-hydroxyphenol) propionic acid alkyl alcohol ester antioxidant is as follows:

[0024]

[0025] In the formula, R3 is a linear or branched C8-C18 hydrocarbon group, preferably a linear or branched C8-C15 hydrocarbon group;

[0026] The friction modifier is diisooctyl phosphite, or isooctyl phosphite octadecylamine salt, or isooctyl phosphate octadecylamine salt, or boronized glycerol oleate monoester, or boronized glycerol oleate diester, or boronized glycerol oleate triester, or a mixture of any combination thereof; preferably, the weight portion of the friction modifier is 3.5 to 15 parts;

[0027] The present invention also provides an application of a manual transmission oil additive composition, wherein the first application is to add the components of the composition into a container according to a proportion, and blend at 50-60° C. for 2 hours until the components are uniformly dissolved, thereby obtaining a manual transmission oil additive composition; and the additive composition is added into a mineral or synthetic base oil at a rate of 5.85 wt %, thereby preparing a manual transmission oil with a viscosity grade of 75W-80, 75W-85, or 75W-90;

[0028] The second is a manual transmission oil blended with a combination of materials, which is suitable for the lubrication of manual transmissions (MT) or automatic manual transmissions (AMT) of passenger cars and commercial vehicles containing synchronizers made of brass, bronze, molybdenum spraying, or carbon fiber.

[0029] The beneficial effects of the present invention are:

[0030] The present invention uses alkyl cyclohexanecarboxylate polysulfide with a special structure as a sulfur-containing agent, and is used in combination with an anti-oxidation and anti-wear multifunctional additive, which not only has good corrosion resistance, but also ensures that the oil product has outstanding extreme pressure and anti-wear performance, and well protects the manual transmission power output shaft and gears;

[0031] High temperature detergent is a compound of a certain proportion of super high base magnesium sulfonate with a TBN greater than 400 and a sulfurized alkylphenol calcium salt with a TBN of 200. The two have a good synergistic effect, which can increase the dynamic friction coefficient of the oil, reduce the static friction coefficient, prevent idling between the gear cones, and effectively solve the durability problem of the oil to different synchronizer materials;

[0032] The use of special structured high molecular weight succinimide containing aromatic amine groups or high molecular weight succinimide containing molybdenum as anti-wear dispersant plays a dual role in improving the high temperature detergency and friction properties of oil products;

[0033] The 3-(3,5-di-tert-butyl-4-hydroxyphenol) propionic acid alkyl alcohol ester antioxidant is compounded with the anti-wear dispersant to ensure that the oil has excellent thermal oxidation stability under high temperature conditions and extend the service life of the oil. DETAILED DESCRIPTION

[0034] The present invention is described in detail below in conjunction with specific implementation modes.

[0035] The following is a detailed description of the embodiments of the present invention. The embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and processes are given. However, the protection scope of the present invention is not limited to the following embodiments. The experimental methods in the following embodiments where specific conditions are not specified are usually based on conventional conditions.

[0036] The present invention provides a manual transmission oil additive composition, which specifically includes: anti-oxidation and anti-wear multifunctional additive: 5-20 parts; sulfur-containing extreme pressure agent: 1.5-10 parts; anti-wear dispersant: 20-40 parts; high-temperature detergent: 30-50 parts; high-temperature antioxidant: 5-15 parts; friction modifier: 3.5-20 parts;

[0037] The anti-oxidation and anti-wear multifunctional additive is a mixture of one or more of dialkyl dithiophosphate zinc salt, diamyl dithiocarbamate and diamyl dithiocarbamate copper; preferably, the weight proportion of the anti-oxidation and anti-wear multifunctional additive is 5 to 15 parts; the dialkyl dithiophosphate zinc salt is one or more of di(2-ethylhexyl) dithiophosphate zinc basic salt, di(4-methyl-2-pentyl) dithiophosphate zinc basic salt, di(2-ethylhexyl) arylamino zinc dithiophosphate, and di(4-methyl-2-pentyl) arylamino zinc dithiophosphate;

[0038] The sulfur-containing extreme pressure agent is cyclohexanecarboxylic acid alkyl ester polysulfide. Preferably, the weight proportion of the sulfur-containing extreme pressure agent is 1.5 to 5 parts; the structure of the cyclohexanecarboxylic acid alkyl ester polysulfide is:

[0039]

[0040] In the formula, m is a positive integer of 1 to 4, preferably, m is 2 or 3, R1 is a linear or branched C1 to C10 hydrocarbon group, preferably, R1 is a linear or branched C3 to C6 hydrocarbon group;

[0041] The anti-wear dispersant is a polymer succinimide containing aromatic amine groups, a polymer succinimide containing molybdenum, or a mixture of any combination of the two; preferably, the weight portion of the anti-wear dispersant is 25 to 40 parts; the structure of the polymer succinimide containing aromatic amine groups is:

[0042]

[0043] Wherein, PIB is polyisobutylene having a molecular weight of 1500 to 2500, R2 is a hydrogen atom or a methyl group or a methoxy group, preferably a hydrogen atom;

[0044] The high-temperature detergent is a mixture of a super-high-base magnesium sulfonate with a TBN greater than 400 and a sulfurized alkylphenol calcium salt with a TBN of 200. The mass ratio of the magnesium sulfonate to the sulfurized alkylphenol calcium salt is 1-4:1, and the preferred ratio is 1-2:1. Preferably, the weight portion of the high-temperature detergent is 30-40 parts. The super-high-base magnesium sulfonate with a TBN greater than 400 is prepared by phase transfer using 80 wt% linear heavy alkylbenzene sulfonic acid and 20% wt C11-C14 long-chain sulfonic acid as raw materials. The sulfurized alkylphenol calcium with a TBN of 200 is a composite of a high-base alkylsulfurized calcium phenate dimer, an alkylsulfurized calcium phenate trimer, an alkylsulfurized calcium phenate tetramer with a TBN of 250 and a low-base alkylsulfurized calcium phenate with a TBN of 130.

[0045] The high temperature antioxidant is a 3-(3,5-di-tert-butyl-4-hydroxyphenol) propionate alkyl alcohol ester antioxidant; preferably, the weight portion of the high temperature antioxidant is 5 to 10 parts; the structure of the 3-(3,5-di-tert-butyl-4-hydroxyphenol) propionate alkyl alcohol ester antioxidant is as follows:

[0046]

[0047] In the formula, R3 is a linear or branched C8-C18 hydrocarbon group, preferably a linear or branched C8-C15 hydrocarbon group;

[0048] The friction modifier is diisooctyl phosphite, or isooctyl phosphite octadecylamine salt, or isooctyl phosphate octadecylamine salt, or boronated glycerol oleate monoester, or boronated glycerol oleate diester, or boronated glycerol oleate triester, or a mixture of any combination thereof; preferably, the weight proportion of the friction modifier is 3.5 to 15 parts.

[0049] The present invention also provides an application of a manual transmission oil additive composition, wherein the components of the composition are added to a container according to a proportion, and the mixture is blended at 50-60° C. for 2 hours until the components are uniformly dissolved, thereby obtaining a manual transmission oil additive composition; the additive composition is added to a mineral or synthetic base oil at a rate of 5.85 wt %, thereby preparing a manual transmission oil with a viscosity grade of 75W-80, 75W-85, or 75W-90;

[0050] Another application of the present invention is that the manual transmission oil prepared by the composition is suitable for lubrication of manual transmissions (MT) or automated manual transmissions (AMT) of passenger cars and commercial vehicles containing synchronizers made of brass, bronze, molybdenum spraying, or carbon fiber.

[0051] Embodiment 1:

[0052] A manual transmission oil additive composition (I) comprises: 10 wt% of zinc di(2-ethylhexyl) dithiophosphate basic salt, 1.5 wt% of di-n-propyl disulfide cyclohexanecarboxylate, 40 wt% of high molecular weight succinimide containing aromatic amine groups, 20 wt% of super high base magnesium sulfonate with a TBN of 423, 20 wt% of sulfonated alkylphenol calcium with a TBN of 208, 5 wt% of 3-(3,5-di-tert-butyl-4-hydroxyphenol) propionate pentadecyl alcohol ester, and 3.5 wt% of isooctyl phosphate octadecylamine salt, the sum of the above components being 100 wt%;

[0053] The additive composition (II) is the same as the composition (I) except that 10 wt% of the di(2-ethylhexyl) zinc dithiophosphate basic salt in the antioxidant and antiwear multifunctional additive is replaced by 10 wt% of the di(4-methyl-2-pentyl) zinc dithiophosphate basic salt;

[0054] Composition (III) is the same as composition (I) except that 10 wt% of di(2-ethylhexyl) zinc dithiophosphate basic salt in the antioxidant and anti-wear multifunctional additive is replaced by 10 wt% of di(2-ethylhexyl) arylamino zinc dithiophosphate;

[0055] Composition (IV) is the same as composition (I) except that 10 wt% of di(2-ethylhexyl) zinc dithiophosphate basic salt in the antioxidant and anti-wear multifunctional additive is replaced by 10 wt% of di(4-methyl-2-pentyl) arylamino zinc dithiophosphate;

[0056] The SRV test machine simulation evaluation method can be used to simulate the thermal stability of FZG load-bearing grade oil with a small amount of oil sample; the test conditions are: 135℃, 168h, steel rod and copper rod catalyst, air flow, and the copper rod weight loss mg / 200ml and total sediment mg / 200ml are mainly evaluated after oxidation;

[0057] Compositions (I), (II), (III) and (IV) were all added to 75W / 80 mineral base oil at 5.85 wt% for evaluation. The properties of the 75W / 80 mineral base oil are shown in Table 1, and the evaluation results are shown in Table 2;

[0058] Table 1 Composition and properties of 75W / 80 mineral base oil

[0059]

[0060] Table 2 Evaluation results of compositions (I) to (IV) in 75W / 80 mineral base oil

[0061]

[0062] The results in Table 2 show that the compositions all have good resistance to copper corrosion and extreme pressure and anti-wear properties; di(2-ethylhexyl) zinc dithiophosphate basic salt has better anti-wear properties than the other three antioxidant and anti-wear multifunctional additives; di(2-ethylhexyl) aromatic amino zinc dithiophosphate has better thermal oxidation stability than the other three antioxidant and anti-wear multifunctional additives.

[0063] Embodiment 2:

[0064] A manual transmission oil additive composition (V) comprises: 15 wt% of di(2-ethylhexyl)arylamino dithiophosphate zinc basic salt, 5 wt% of di-n-butyl disulfide cyclohexanecarboxylate, 25 wt% of high molecular weight succinimide containing aromatic amine groups, 20 wt% of super high base magnesium sulfonate with a TBN of 423, 10 wt% of sulfonated alkylphenol calcium with a TBN of 208, 10 wt% of 3-(3,5-di-tert-butyl-4-hydroxyphenol) propionate n-octyl alcohol ester, and 15 wt% of boronated glycerol oleate, the sum of the above components being 100 wt%;

[0065] The additive composition (VI) is the same as the composition (V) except that 25 wt% of the high molecular weight succinimide containing aromatic amine groups in the antiwear dispersant is replaced by 25 wt% of the high molecular weight succinimide containing molybdenum;

[0066] The SRV test machine simulation evaluation method is used to test the change of the friction coefficient of the oil under the same test conditions over time. Generally speaking, the more stable the change of the friction coefficient is, the more conducive it is to the stable operation of the synchronizer.

[0067] The high temperature detergency of the oil was tested by evaporation loss (SH / T0059, 250°C, 1h), coke plate (plate temperature 320°C, oil temperature 150°C, 4h), and dynamic micro-oxidation (CMOT, 230°C, oil injection 17.5-19.5μg, air 20mL / min); compositions (V) and (VI) were added to 75W / 90 mineral base oil at 5.85wt% for evaluation. The properties of 75W / 90 mineral base oil are shown in Table 3, and the evaluation results are shown in Table 4.

[0068] Table 3 Composition and properties of 75W / 90 mineral base oil

[0069]

[0070] Table 4 Evaluation results of compositions (V) and (VI) in 75W / 90 mineral base oil

[0071]

[0072] As can be seen from the above table, the friction coefficient changes of the high molecular weight succinimide containing aromatic amine groups and the high molecular weight succinimide containing molybdenum are both very stable, and both have good synchronizer durability; the high molecular weight succinimide containing aromatic amine groups has better high-temperature cleanliness than the high molecular weight succinimide containing molybdenum.

[0073] Embodiment 3:

[0074] The manual transmission oil additive composition (VII) comprises: 5 wt% of di(2-ethylhexyl)arylamino zinc dithiophosphate basic salt, 10 wt% of di(2-ethylhexyl)arylamino zinc dithiophosphate, 2.25 wt% of di-n-hexyl trisulfide cyclohexanecarboxylate, 16 wt% of high molecular weight succinimide containing aromatic amine groups, 16 wt% of high molecular weight succinimide containing molybdenum, 24 wt% of super high base magnesium sulfonate with a TBN of 409, 12 wt% of sulfonated alkylphenol calcium with a TBN of 215, 5.5 wt% of nonyl 3-(3,5-di-tert-butyl-4-hydroxyphenol)propionate, and 9.25 wt% of diisooctyl phosphite, and the sum of the above components is 100 wt%.

[0075] Composition (VII) was added to 75W / 85 synthetic base oil at 5.85 wt% for evaluation. The properties of 75W / 85 synthetic base oil are shown in Table 5, and the evaluation results are shown in Table 6;

[0076] Table 5 Composition and properties of 75W / 85 synthetic base oil

[0077]

[0078] Table 6 Evaluation results of composition (VII) of Example 3

[0079]

[0080]

[0081] It can be seen from the above table that the composition (VII) manual transmission oil additive composition has passed the FZG gear machine load level test, FZG pitting test, L-60-1 oxidation test and SSP180 synchronization durability test of different materials. It has good synchronizer durability, thermal oxidation stability, pitting resistance, corrosion resistance and friction characteristics, especially the average wear rate is very low, indicating excellent anti-wear performance, providing good protection for the manual transmission power output shaft and gears. It is suitable for lubrication of passenger car and commercial vehicle manual transmission (MT) or manual automatic transmission (AMT) containing synchronizers of various materials such as brass, bronze, molybdenum spraying, carbon fiber, etc.

[0082] The present invention may also have other various embodiments, and those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the protection scope of the claims of the present invention.

Claims

1. A manual transmission oil additive composition, characterized in that: The composition specifically includes: anti-oxidation and anti-wear multifunctional additive: 5-20 parts; sulfur-containing extreme pressure agent: 1.5-10 parts; anti-wear dispersant: 20-40 parts; high-temperature detergent: 30-50 parts; high-temperature antioxidant: 5-15 parts; friction modifier: 3.5-20 parts; The anti-oxidation and anti-wear multifunctional additive is a mixture of one or more of dialkyl dithiophosphate zinc salt, diamyl dithiocarbamate amine and diamyl dithiocarbamate copper; The dialkyl dithiophosphate zinc salt is one or more of di(2-ethylhexyl) dithiophosphate zinc basic salt, di(4-methyl-2-pentyl) dithiophosphate zinc basic salt, di(2-ethylhexyl) arylamino dithiophosphate zinc, and di(4-methyl-2-pentyl) arylamino dithiophosphate zinc. The sulfur-containing extreme pressure agent is cyclohexanecarboxylic acid alkyl ester polysulfide, and the structure of the cyclohexanecarboxylic acid alkyl ester polysulfide is: In the formula, m is a positive integer of 1 to 4, and R1 is a linear or branched C1 to C10 hydrocarbon group; The anti-wear dispersant is a polymer succinimide containing aromatic amine groups, a polymer succinimide containing molybdenum, or a mixture of any combination of the two; the structure of the polymer succinimide containing aromatic amine groups is: Wherein, PIB is polyisobutylene having a molecular weight of 1500 to 2500, and R2 is a hydrogen atom or a methyl group or a methoxy group; The high temperature detergent is a mixture of an ultra-high base magnesium sulfonate with a TBN greater than 400 and a sulfurized alkylphenol calcium salt with a TBN of 200, wherein the mass ratio of the magnesium sulfonate to the sulfurized alkylphenol calcium salt is 1 to 4:

1. The high temperature antioxidant is a 3-(3,5-di-tert-butyl-4-hydroxyphenol) propionate alkyl alcohol ester antioxidant; the structure of the 3-(3,5-di-tert-butyl-4-hydroxyphenol) propionate alkyl alcohol ester antioxidant is as follows: In the formula, R3 is a linear or branched C8-C18 hydrocarbon group; The friction modifier is diisooctyl phosphite, or isooctyl phosphite octadecylamine salt, or isooctyl phosphate octadecylamine salt, or boronized glycerol oleate monoester, or boronized glycerol oleate diester, or boronized glycerol oleate triester, or a mixture of any combination thereof.

2. The manual transmission oil additive composition according to claim 1, characterized in that: In the structure of the cyclohexanecarboxylic acid alkyl ester polysulfide, m is 2 or 3; R1 is a linear or branched C3-C6 hydrocarbon group.

3. The manual transmission oil additive composition according to claim 1, characterized in that: In the structure of the polymer succinimide containing aromatic amine groups, R2 is a hydrogen atom.

4. The manual transmission oil additive composition according to claim 1, characterized in that: The ultra-high base magnesium sulfonate with a TBN greater than 400 is prepared by phase transformation using 80 wt% linear heavy alkylbenzene sulfonic acid and 20% wt C11-C14 long-chain sulfonic acid as raw materials; the alkyl phenoxide calcium sulfide with a TBN of 200 is compounded by a high base alkyl phenoxide calcium sulfide dimer, an alkyl phenoxide calcium sulfide trimer, an alkyl phenoxide calcium sulfide tetramer with a TBN of 250 and a low base alkyl phenoxide calcium sulfide with a TBN of 130.

5. The manual transmission oil additive composition according to claim 1, characterized in that: In the structure of the 3-(3,5-di-tert-butyl-4-hydroxyphenol) propionic acid alkyl alcohol ester antioxidant, R3 is a linear or branched C8-C15 hydrocarbon group.

6. The manual transmission oil additive composition according to claim 1, characterized in that: The weight proportion of the anti-oxidation and anti-wear multifunctional additive is 5 to 15 parts; the weight proportion of the sulfur-containing extreme pressure agent is 1.5 to 5 parts; the weight proportion of the anti-wear dispersant is 25 to 40 parts; the preferred ratio of the magnesium sulfonate salt: the sulfurized alkylphenol calcium salt is 1 to 2:1; the weight proportion of the high-temperature detergent is 30 to 40 parts; the weight proportion of the high-temperature antioxidant is 5 to 10 parts; and the weight proportion of the friction modifier is 3.5 to 15 parts.

7. The use of the manual transmission oil additive composition according to any one of claims 1 to 6, characterized in that: The components of the composition are added into a container according to a proportion, and blended at 50-60° C. for 2 hours until the components are uniformly dissolved to obtain a manual transmission oil additive composition; the additive composition is added into a mineral or synthetic base oil at 5.85 wt % to prepare manual transmission oils with viscosity grades of 75W-80, 75W-85, and 75W-90.

8. The use of the manual transmission oil additive composition according to any one of claims 1 to 6, characterized in that: The manual transmission oil prepared by the composition is suitable for lubricating manual transmissions (MT) or automated manual transmissions (AMT) of passenger cars and commercial vehicles containing synchronizers made of brass, bronze, molybdenum or carbon fiber.

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