Medium ash type low-emission gas engine oil composition

Abstract

The invention discloses a medium ash type low-emission gas engine oil composition, and particularly relates to the field of gas engine oil additives. The composition is formed by compounding high-base-number magnesium sulfonate, low-base-number calcium sulfonate, high-base-number sulfurized calcium alkyl phenolate, zinc dialkyl dithiophosphate, a high-molecular ashless dispersant, an amine type and phenol type antioxidant, dibutyl dithiocarbamate, an RHY580 hindered amine compound and the like, the base number of the high-base-number magnesium sulfonate is 395-420 mgKOH / g, the base number of the low-base-number calcium sulfonate is 4-6 mgKOH / g, and the base number of the low-base-number calcium sulfonate is 4-6 mgKOH / g. The base number of the low-base-number calcium sulfonate is 20 to 35 mgKOH / g, and the base number of the high-base-number sulfurized calcium alkyl phenolate is 245 to 265 mgKOH / g. The composition is applied to gas engine oil blended in API type II and III base oil, tests such as HTCBT, Cat.1 M-PC, a program VIII and rubber compatibility are passed, the sulfate ash content of the composition is 0.72%, the base number is 7.4 mgKOH / g, the sulfur content is 2800ppm, the phosphorus content is 730ppm, various detection data meet standard requirements, and meanwhile, the oil change mileage of an oil product can reach 60000 kilometers.

Description

Technical Field

[0001] The present invention relates to the technical field of gas engine oil additives, and more particularly to a medium-ash low-emission gas engine oil composition. Background Art

[0002] Traditional energy vehicles will gradually be replaced by new clean energy such as gas, methanol, hydrogen fuel, electric vehicles, etc. At present, the development of methanol and hydrogen fuel engines for heavy-duty vehicles is in its infancy, while heavy-duty engines fueled by natural gas have been widely used in many regions of my country.

[0003] In particular, in the National VI emission stage, NOx and PM will be reduced by more than 60% compared with the National V stage, and the particulate matter number (PN) limit requirements will be increased. The natural gas-fueled heavy-duty truck spark-ignition natural gas engine adopts the equivalent combustion mode and uses a three-way catalytic converter and a waste recirculation system. THC and NOx have a very high conversion efficiency, up to 100% conversion, while reducing THC, CO and NOx emissions, achieving the reduction of exhaust pollutants. It is easy to achieve emission requirements and is highly praised by OEMs. After adopting equivalent combustion and three-way catalytic converter technology, the engine heat load is increased, further improving the requirements for the oil's anti-oxidation and high-temperature cleanliness, and also improving the oil's comprehensive performance requirements such as anti-oxidation, anti-nitrification and anti-wear.

[0004] By solving the stringent requirements of gas engine oil on antioxidant and anti-wear properties under low sulfated ash conditions, a gas engine oil composite additive composition was successfully developed. It was applied to API II and III base oils to blend medium-ash low-emission gas engine oil with suitable sulfated ash and high alkalinity. It passed the HTCBT, Cat.1M-PC, Procedure VIII and rubber compatibility tests. Its sulfated ash content is 0.72%, the alkalinity is 7.4 mgKOH / g, the sulfur content is 2800 ppm, and the phosphorus content is 730 ppm. All test data meet the standard requirements. At the same time, the oil change mileage can reach 60,000 kilometers. Summary of the invention

[0005] Based on the above, the object of the present invention is to provide a gas engine oil composition, which can be added to API II and III base oils, and after being mixed with OCP viscosity index improvers and PMA pour point depressants, the medium ash type low emission gas engine oil blended at a certain dosage not only has suitable sulfated ash and high base number, but also passes HTCBT, Cat.1M-PC, procedure VIII and rubber compatibility tests, and has a sulfated ash content of 0.72%, a base number of 7.4 mgKOH / g, a sulfur content of 2800 ppm, and a phosphorus content of 730 ppm. Various test data meet the standard requirements, and the oil change mileage can reach 60,000 kilometers.

[0006] To this end, the present invention provides a medium-ash low-emission gas engine oil composition, which is compounded by high-base magnesium sulfonate, low-base calcium sulfonate, high-base sulfurized alkyl phenol calcium, dialkyl dithiophosphate zinc, polymer ashless dispersant, amine-type and phenol-type antioxidants, dibutyl dithiocarbamate and a RHY580 hindered amine compound.

[0007] The high base magnesium sulfonate has an alkalinity of 395-420 mgKOH / g, the low base calcium sulfonate has an alkalinity of 20-35 mgKOH / g, the high base sulfurized alkyl phenol calcium has an alkalinity of 245-265 mgKOH / g, the dialkyl zinc dithiophosphate antioxidant and anti-wear agent is dioctyl zinc dithiophosphate, the polymer ashless dispersant is a polymer succinimide ashless dispersant, the amine antioxidant is a hindered phenol ester, the phenol antioxidant is butyl octyl diphenylamine, and the carbamate is dibutyl dithiocarbamate.

[0008] Specifically, the medium-ash low-emission gas engine oil composition of the present invention is compounded by high-base magnesium sulfonate, low-base calcium sulfonate, high-base sulfurized alkyl phenol calcium, dialkyl dithiophosphate zinc, polymer ashless dispersant, amine-type and phenol-type antioxidants and dibutyl dithiocarbamate, so that the performance of each component is organically synergistic, and a gas engine oil with better high-temperature detergency, antioxidant property, anti-nitration property, dispersibility and wear resistance is obtained under the condition of lower sulfate ash content.

[0009] The medium-ash low-emission gas engine oil composition of the present invention is preferably compounded according to the following weight percentages: 5.5-8.0% of the high-base magnesium sulfonate detergent, more preferably 6.0-7.0%; 20.0-35.0% of the low-base calcium sulfonate detergent, more preferably 25.0-30.0%; 5.0-7.0% of the high-base sulfurized alkyl phenol calcium detergent, more preferably 5.5-6.5%; 10.0-12.0% of the dialkyl dithiophosphate zinc antioxidant and anticorrosion agent. %, more preferably 10.5-11.5%; the polymer ashless dispersant 30.0-40.0%, more preferably 33.0-38.0%; the amine antioxidant 4.0-6.0%, more preferably 4.5-5.5%; the phenolic antioxidant 4.0-6.0%, more preferably 4.5-5.5%; the dibutyl dithiocarbamate 2.5-3.5%, more preferably 2.8-3.3%; the RHY580 hindered amine compound 0.1-1.0%, more preferably 0.3-0.8%.

[0010] In the gas engine oil composition of the present invention, it is preferred that the high base value sulfurized alkyl phenol calcium detergent is T115B.

[0011] In the gas engine oil composition of the present invention, preferably, the overbased magnesium sulfonate detergent is T107.

[0012] In the gas engine oil composition of the present invention, preferably, the low base value calcium sulfonate detergent is T104.

[0013] In the gas engine oil composition of the present invention, it is preferred that the dialkyl zinc dithiophosphate antioxidant and anticorrosion agent is dioctyl zinc dithiophosphate T203.

[0014] In the gas engine oil composition of the present invention, it is preferred that the polymer ashless dispersant is a polymer succinimide ashless dispersant T161A.

[0015] In the gas engine oil composition of the present invention, preferably, the amine antioxidant is hindered phenol ester RHY505.

[0016] In the gas engine oil composition of the present invention, preferably, the phenolic antioxidant is butyl octyl diphenylamine RHY057.

[0017] In the gas engine oil composition of the present invention, it is preferred that the amine carbamate is dibutyl dithiocarbamate.

[0018] The medium-ash low-emission gas engine oil composition of the present invention comprises the following components:

[0019] Overbased magnesium sulfonate, 6.0-7.0wt%;

[0020] Low base calcium sulfonate, 25.0-30.0wt%;

[0021] High base value sulfurized calcium alkyl phenol, 5.5-6.5wt%;

[0022] Zinc dialkyl dithiophosphate, 10.5-11.5 wt %;

[0023] High molecular weight succinimide, 30.0-40.0wt%;

[0024] Amine antioxidant, 4.5-5.5wt%;

[0025] Phenolic antioxidant, 4.5-5.5wt%;

[0026] Carbamate, 2.8-3.3wt%;

[0027] RHY580 hindered amine compound, 0.3-0.8wt%;

[0028] To this end, the present invention also provides a medium-ash low-emission gas engine oil composition, characterized in that it comprises the following components:

[0029] Gas engine oil composition, 9.1 wt%;

[0030] OCP type viscosity modifier, 7.0-9.0wt%;

[0031] PMA type pour point depressant 0.2-0.5wt%;

[0032] The balance is base oil.

[0033] In the medium ash low emission gas engine oil composition of the present invention, preferably, the base oil is an API II or III base oil.

[0034] The beneficial effects of the present invention are as follows:

[0035] First, the metal detergent system composed of high-base magnesium sulfonate, low-base calcium sulfonate and high-base sulfurized alkylphenol calcium in the present invention can solve the low-speed pre-ignition problem of a gas engine after using a three-way catalytic device;

[0036] Second, the antioxidant and cleaning system composed of high-base magnesium sulfonate, low-base calcium sulfonate, high-base sulfurized alkyl phenol calcium, dialkyl dithiophosphate zinc, amine-type and phenol-type antioxidants in the present invention can meet the stringent requirements of high-temperature oxidation characteristics and deposit generation control ability of gas engine oil under the conditions of low phosphorus, sulfur and sulfate ash content, and gas engines adopting EGR, three-way catalysis and equivalent combustion technology;

[0037] Third, the composite additive system of the present invention, which is composed of high-alkalinity magnesium sulfonate, low-alkalinity calcium sulfonate, high-alkalinity sulfurized alkylphenol calcium, dialkyl dithiophosphate zinc, polymer ashless dispersant, amine-type, phenol-type antioxidants and dibutyl dithiocarbamate, achieves the anti-wear and durability performance of gas engine oil under low sulfate ash conditions. DETAILED DESCRIPTION

[0038] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] Example 1.

[0040] Example 1 discloses a gas engine oil composition, which comprises the following components calculated by percentage:

[0041] Overbased magnesium sulfonate 0.4 g;

[0042] Low base calcium sulfonate 2.9g;

[0043] High base value sulfurized calcium alkyl phenol 0.6g;

[0044] Zinc dialkyl dithiophosphate 1.1 g;

[0045] 4.0g polymer ashless dispersant;

[0046] Amine antioxidant 0.8g;

[0047] Phenolic antioxidant 0.8g;

[0048] Dibutyl dithiocarbamate 0.1 g;

[0049] RHY580 hindered amine compound 0.5g;

[0050] OCP type viscosity agent 8.5g;

[0051] PMA type pour point depressant 0.3g;

[0052] Type II base oil 8g;

[0053] 66g of Class III base oil.

[0054] This embodiment also discloses a method for preparing a gas engine oil composition, the specific steps of which are:

[0055] Add 0.4g of high base magnesium sulfate, 2.9g of low base calcium sulfonate, 0.6g of high base alkyl phenol calcium sulfate group, and then add 1.1g of dialkyl dithiophosphate zinc, 4.0g of polymer ashless dispersant, 0.8g of amine antioxidant, 0.8g of phenolic antioxidant, 0.8g of dialkyl dithiocarbamate, 0.5g of RHY580 hindered amine compound, 8.5g of OCP viscosity index agent, 0.3g of PMA pour point depressant, 8g of Class II base oil, and 66g of Class III base oil to the container; maintain 55-65°C, stir for 1-2 hours, and filter to obtain a gas engine oil composition product.

[0056] Example 2

[0057] Example 2 discloses a gas engine oil composition, which comprises the following components calculated by percentage:

[0058] Overbased magnesium sulfonate 0.5 g;

[0059] Low base calcium sulfonate 2.6g;

[0060] High base value sulfurized alkylphenol calcium 0.5g;

[0061] Zinc dialkyl dithiophosphate 1.05 g;

[0062] 3.7g polymer ashless dispersant;

[0063] Amine antioxidant 0.6g;

[0064] Phenolic antioxidant 0.6g;

[0065] Dibutyl dithiocarbamate 0.2 g;

[0066] RHY580 hindered amine compound 0.5g;

[0067] OCP type viscosity agent 8.5g;

[0068] PMA type pour point depressant 0.3g;

[0069] Type II base oil 8g;

[0070] 72g of Class III base oil.

[0071] This embodiment also discloses a method for preparing a gas engine oil composition, the specific steps of which are:

[0072] Add 0.5g of high base magnesium sulfonate, 2.6g of low base calcium sulfonate, 0.5g of high base sulfurized alkyl phenol calcium into a container, and then add 1.05g of dialkyl zinc dithiophosphate, 3.7g of polymer ashless dispersant, 0.6g of amine antioxidant, 0.6g of phenolic antioxidant, 0.2g of dibutyl dithiocarbamate, 0.5g of RHY580 hindered amine compound, 8.5g of OCP viscosity index agent, 0.3g of PMA pour point depressant, 8g of Class II base oil, and 72g of Class III base oil in sequence; maintain 55-65°C, stir for 1-2 hours, and obtain a gas engine oil composition product by filtration.

[0073] Example 3

[0074] Example 3 discloses a gas engine oil composition, which comprises the following components calculated by percentage:

[0075] Overbased magnesium sulfonate 0.6 g;

[0076] Low base calcium sulfonate 2.3g;

[0077] High base value sulphurized calcium alkyl phenol 0.4g;

[0078] Zinc dialkyl dithiophosphate 1g;

[0079] 3.4g polymer ashless dispersant;

[0080] Amine antioxidant 0.5g;

[0081] Phenolic antioxidant 0.5g;

[0082] Dibutyl dithiocarbamate 0.2 g;

[0083] RHY580 hindered amine compound 0.6g;

[0084] OCP type viscosity agent 8.5g;

[0085] PMA type pour point depressant 0.3g;

[0086] Type II base oil 8g;

[0087] 66.5g of Class III base oil.

[0088] This embodiment also discloses a method for preparing a gas engine oil composition, the specific steps of which are:

[0089] Add 0.6g of high base magnesium sulfonate, 2.3g of low base calcium sulfonate, 0.4g of high base sulfurized alkyl phenol calcium into a container, and then add 1g of dialkyl zinc dithiophosphate, 3.4g of polymer ashless dispersant, 0.5g of amine antioxidant, 0.5g of phenolic antioxidant, 0.2g of dibutyl dithiocarbamate, 0.6g of RHY580 hindered amine compound, 8.5g of OCP viscosity index agent, 0.3g of PMA pour point depressant, 8g of Class II base oil, and 66.5g of Class III base oil in sequence; maintain 55-65°C, stir for 1-2 hours, and obtain a gas engine oil composition product by filtration.

[0090] Example 4

[0091] Example 4 discloses a gas engine oil composition, which comprises the following components calculated by percentage:

[0092] Overbased magnesium sulfonate 0.5 g;

[0093] Low base calcium sulfonate 2.3g;

[0094] High base value sulfurized alkylphenol calcium 0.5g;

[0095] Zinc dialkyl dithiophosphate 1g;

[0096] 3.4g polymer ashless dispersant;

[0097] Amine antioxidant 0.5g;

[0098] Phenolic antioxidant 0.5g;

[0099] Dibutyl dithiocarbamate 0.3 g;

[0100] RHY580 hindered amine compound 0.6g;

[0101] OCP type viscosity agent 8.5g;

[0102] PMA type pour point depressant 0.3g;

[0103] Type II base oil 8g;

[0104] 71.5g of Class III base oil.

[0105] This embodiment also discloses a method for preparing a gas engine oil composition, the specific steps of which are:

[0106] Add 0.5g of high base magnesium sulfonate, 2.3g of low base calcium sulfonate, and 0.5g of high base sulfurized alkyl phenol calcium into a container, and then add 1g of dialkyl zinc dithiophosphate, 3.4g of polymer ashless dispersant, 0.5g of amine antioxidant, 0.5g of phenol antioxidant, 0.3g of dibutyl dithiocarbamate, 0.6g of RHY580 hindered amine compound, 8.5g of OCP viscosity index agent, 0.3g of PMA pour point depressant, 8g of Class II base oil, and 71.5g of Class III base oil in sequence; maintain 55-65°C, stir for 1-2 hours, and obtain a gas engine oil composition product by filtration.

[0107] Example 5

[0108] Example 5 discloses a gas engine oil composition, which comprises the following components calculated by percentage:

[0109] Overbased magnesium sulfonate 0.5 g;

[0110] Low base calcium sulfonate 2.5g;

[0111] High base value sulphurized calcium alkyl phenol 0.4g;

[0112] Zinc dialkyl dithiophosphate 0.95 g;

[0113] 3.8g polymer ashless dispersant;

[0114] Amine antioxidant 0.6g;

[0115] Phenolic antioxidant 0.6g;

[0116] Dibutyl dithiocarbamate 0.3 g;

[0117] RHY580 hindered amine compound 0.7g;

[0118] OCP type viscosity agent 8.5g;

[0119] PMA type pour point depressant 0.3g;

[0120] Type II base oil 8g;

[0121] 68g of Class III base oil.

[0122] This embodiment also discloses a method for preparing a gas engine oil composition, the specific steps of which are:

[0123] Add 0.5g of high base magnesium sulfonate, 2.5g of low base calcium sulfonate, 0.4g of high base sulfurized alkyl phenol calcium into a container, and then add 0.95g of dialkyl zinc dithiophosphate, 3.8g of polymer ashless dispersant, 0.6g of amine antioxidant, 0.6g of phenolic antioxidant, 0.3g of dibutyl dithiocarbamate, 0.7g of RHY580 hindered amine compound, 8.5g of OCP viscosity index agent, 0.3g of PMA pour point depressant, 8g of Class II base oil, and 68g of Class III base oil in sequence; maintain 55-65°C, stir for 1-2 hours, and obtain a gas engine oil composition product by filtration.

[0124] In order to test the performance of the medium ash low emission gas engine oil composition, the gas engine oil composite additive composition, OCP viscosity index agent, and PMA pour point depressant were applied to API II and III base oils, and the blended test oils were tested. The specific results are shown in Table 1.

[0125] Table 1 Oil performance test results

[0126]

[0127] It can be seen from Examples 1-5 and their evaluation results in the above table that the oils blended from Examples 1 to 5 have different performances in terms of antioxidant performance, wear resistance, high-temperature detergency and dispersibility. Overall, the medium-ash low-emission gas engine oil blended from Example 4 has the best comprehensive performance.

[0128] In this patent, the medium ash low emission gas engine oil prepared in Example 4 was selected to conduct Cat.1M-PC and Procedure VIII, HTCBT, and rubber compatibility tests. The specific results are detailed in the following section.

[0129] Table 2 Physical and chemical analysis results of oil products

[0130]

[0131] Table 3 Oil bench test results

[0132]

[0133]

[0134] From the above, it can be seen that the beneficial effects of the present invention are as follows:

[0135] A gas engine oil composition proposed in the present invention solves the stringent requirements of gas engine oil on anti-oxidation performance and anti-wear performance under low sulfated ash conditions. The gas engine oil composition is successfully developed and applied to API II and III base oils to prepare a medium-ash low-emission gas engine oil having suitable sulfated ash and high base number, and has passed tests such as HTCBT, Cat.1M-PC, procedure VIII and rubber compatibility. The sulfated ash content is 0.72%, the base number is 7.4 mgKOH / g, the sulfur content is 2800 ppm, the phosphorus content is 730 ppm, and various test data meet standard requirements. At the same time, the oil change mileage can reach 60,000 kilometers.

[0136] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0137] Secondly: In the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the case of no conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0138] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A medium-ash low-emission gas engine oil composition, comprising, characterized in that: The composition is compounded by high-basicity magnesium sulfonate, low-basicity calcium sulfonate, high-basicity sulfurized alkyl phenol calcium, dialkyl dithiophosphate zinc, high-molecular ashless dispersant, amine-type and phenol-type antioxidants, dibutyl dithiocarbamate and a RHY580 hindered amine compound. The high base magnesium sulfonate has an alkalinity of 395-420 mgKOH / g, the low base calcium sulfonate has an alkalinity of 20-35 mgKOH / g, the high base sulfurized alkyl phenol calcium has an alkalinity of 245-265 mgKOH / g, the dialkyl zinc dithiophosphate antioxidant and anti-wear agent is dioctyl zinc dithiophosphate, the polymer ashless dispersant is a polymer succinimide ashless dispersant, the amine antioxidant is a hindered phenol ester, the phenol antioxidant is butyl octyl diphenylamine, and the carbamate is dibutyl dithiocarbamate.

2. A medium ash type low emission gas engine oil composition according to claim 1, characterized in that: The components in the composition are compounded according to the following weight percentages: 5.5-8.0% of the high base magnesium sulfonate detergent, more preferably 6.0-7.0%; 20.0-35.0% of the low base calcium sulfonate detergent, more preferably 25.0-30.0%; 5.0-7.0% of the high base sulfurized alkyl phenol calcium detergent, more preferably 5.5-6.5%; 10.0-12.0% of the dialkyl dithiophosphate zinc antioxidant and anticorrosive agent, more preferably 10.5-11.5 %, the polymer ashless dispersant 30.0-40.0%, more preferably 33.0-38.0%; the amine antioxidant 4.0-6.0%, more preferably 4.5-5.5%; the phenolic antioxidant 4.0-6.0%, more preferably 4.5-5.5%; the dibutyl dithiocarbamate 2.5-3.5%, more preferably 2.8-3.3%; the RHY580 hindered amine compound 0.1-1.0%, more preferably 0.3-0.8%.

3. A medium ash low emission gas engine oil composition according to claim 1, characterized in that: The high base value sulfurized alkyl phenate calcium detergent is T115B.

4. A medium ash low emission gas engine oil composition according to claim 1, characterized in that: The overbased magnesium sulfonate detergent is T107.

5. The medium ash type low emission gas engine oil composition according to claim 1, characterized in that: The low base value calcium sulfonate detergent is T104.

6. A medium ash low emission gas engine oil composition according to claim 1, characterized in that: The dialkyl zinc dithiophosphate antioxidant and anticorrosive agent is dioctyl zinc dithiophosphate T203.

7. A medium ash type low emission gas engine oil composition according to claim 1, characterized in that: The polymer ashless dispersant is polymer succinimide ashless dispersant T161A.

8. The medium ash low emission gas engine oil composition according to claim 1, characterized in that: The amine antioxidant is hindered phenol ester RHY505.

9. The medium ash low emission gas engine oil composition according to claim 1, characterized in that: The phenolic antioxidant is butyl octyl diphenylamine RHY057.

10. The medium ash low emission gas engine oil composition according to claim 1, characterized in that: The RHY580 hindered amine compound has a molecular structure as follows: Wherein R1, R2, R3, R4 may be H or C1-C4 alkyl; X may be H or C1-C8 alkyl; Y may be -S-, -O-, wait; Z may be an aromatic compound, such as alkylphenol, salicylic acid, salicyl alcohol, alkylbenzene, etc.; R5 may be one or more H or C1-C24 alkyl.

11. The medium ash low emission gas engine oil composition according to claim 1, characterized in that: Contains the following ingredients: Overbased magnesium sulfonate, 6.0-7.0wt%; Low base calcium sulfonate, 25.0-30.0wt%; High base value sulfurized calcium alkyl phenol, 5.5-6.5wt%; Zinc dialkyl dithiophosphate, 10.5-11.5 wt %; High molecular weight succinimide, 30.0-40.0wt%; Amine antioxidant, 4.5-5.5wt%; Phenolic antioxidant, 4.5-5.5wt%; Carbamate, 2.8-3.3wt%; RHY580 hindered amine compound, 0.3-0.8wt%.

12. The medium ash low emission gas engine oil composition according to claim 1, characterized in that: Contains the following ingredients: The medium ash low emission gas engine oil composition according to claim 11, 8.5-9.5wt%; OCP type viscosity modifier, 7.0-9.0wt%; PMA type pour point depressant 0.2-0.5wt%; The balance is base oil.

13. The medium ash low emission gas engine oil composition according to claim 1, characterized in that: The base oil is API II and III base oil.

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