| abstract |
The present invention is directed to provide an engine oil composition which fully exploits the performance of molybdenum dithiocarbamate (MoDTC). restricts degradation of MoDTC itself, and has, a high MoDTC residual property even at the time of degradation, hence providing low friction and low wear for a long time, and which results in savings in fuel consumption. It is also directed to an engine oil composition having a high coefficient of friction and an extreme-pressure property under fluid lubricating conditions arising from extreme-pressures, in order to solve various problems encountered in friction. The engine oil compositions according to the present invention comprise a specific MoDTC, a specific zinc dithiophosphate and a base oil for engine oil as the essential components, and specific polyglycerin half esters may be further added. |