| 摘要 |
The use of at least one metal-containing detergent and at least one zinc dihydrocarbyl dithiophosphate as lubricating oil additives for reducing wear, especially for reducing wear when operating at low temperatures, at least 50 mass % of the total metal-containing detergent being overbased calcium detergent having a total base number of at least 250, at least 50 mass % of the total metal in the metal-containing detergent being calcium, at least 35 mole % of the zinc dihydrocarbyl dithiophosphate hydrocarbyl groups being secondary hydrocarbyl groups containing up to 5 carbon atoms, and 0 to 25 mole % of the zinc dihydrocarbyl dithiophosphate hydrocarbyl groups being primary hydrocarbyl groups. |
