Lubricant oil composition for diesel engines (LAW913)
AssigneeTonen Corporation
InventorsSatoshi Ogano, Toshiaki Kuribayashi
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Abstract
The present invention relates to a lubricant oil composition, comprising a base oil composed of a mineral and/or synthetic oil incorporated with at least two types of additives (A) and (B) described below, characterized by being used for diesel engines operating with large quantities of soot in their oil, in particular those equipped with an exhaust gas recirculation (EGR) system: (A) sulfurized oxymolybdenum dithiocarbamate at 0.03 to 0.50 wt % as Mo, based on the whole composition, and (B) zinc dialkyl dithiophosphate at 0.04 to 0.50 wt % as P, also based on the whole composition.
Claims3
A method for reducing soot induced wear of a diesel engine lubricated with a lubricating oil wherein the oil becomes contaminated with from about 0.2 wt % to 10 wt % soot, the method comprising lubricating the diesel engine with a lubricating oil comprising a base oil composed of a mineral and/or synthetic oil incorporated with at least two types of additives (A) and (B):
- (A) sulfurized oxymolybdenum dithiocarbamate (MoDTC) having the formula:
- wherein R1 and R2 are the same or different hydrocarbon groups of from 4 to 18 carbon atoms, m and n are each positive integers and the sum of m and n equals 4, the MoDTC being present at 0.03 to 0.50 wt % Mo, based on the whole composition;
- and
- (B) zinc dialkyl dithiophosphate (ZDTP) having the formula
- wherein R3 and R4 are the same or different primary or secondary alkyl groups of from 1 to 18 carbon atoms, the ZDTP being present at 0.04 to 5.0 wt % P, based on the whole composition.
Dependencies are inferred from the claim text.