LUBE OIL ANTIOXIDANTS

摘要

The present invention provides for lubricating oil compositions comprising the synergistic combination of a synthetic lube base stock, an aminic antioxidant, a phenolic antioxidant and an antioxidancy enhancing amount of oil soluble or oil dispersible multiring aromatics such as 2, 3 and 4 ring multiring aromatics in a minor amount, typically less than 25 wt.%, but more preferably at least about 4.0 wt.%. The present invention also provides for a method of enhancing the antioxidancy of the synthetic lube base stock containing an aminic and a phenolic antioxidant by addition of the aforementioned multiring aromatics. The invention has utility in lube applications.