Patent ID: 6207625
Filing Date: 2001-03-27
Classification: C10M,C10N

Abstract:
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: ##STR3##wherein R.sup.1 and R.sup.2 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 ##STR4##wherein R.sup.3 and R.sup.4 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.