Engine oil composition

Details Engine oil composition Engine oil composition

C - Chemistry, Metallurgy

10

M

C10M 141/12 (2006.01) C10M 135/18 (2006.01) C10M 137/10 (2006.01) C10M 141/10 (2006.01)

Patent

CA 2170503

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.

Composition d'huile de moteur contenant du dithiocarbamate de molybdène (MoDTC), du dithiophosphate de zinc et une huile de base comme ingrédients essentiels, ainsi que, si on le désire, un demi-ester de polyglycérol. Cette composition permet d'exploiter au maximum les caractéristiques du MoDTC afin de résoudre plusieurs problèmes liés au frottement, de supprimer la détérioration du MoDTC lui-même, de maintenir la teneur résiduelle en MoDTC à des valeurs élevées qui prolongent l'effet de réduction de la friction et de l'usure, et ceci même après la détérioration de l'huile, ce qui contribue à la réduction de la consommation de carburant. Cette composition présente également un coefficient de friction désirable ainsi que de bonnes performances dans des conditions de pression extrême et de lubrification hydrodynamique.

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