LUBRIFICANT COMPOSITION COMPRISING A DISPERSANT, A TRINUCLEAR MOLYBDENUM COMPOUND AND A DIFFERENT OTHER ANTIOXIDANT

摘要

This invention relates to a diesel engine lubricant composition comprising abase stock, a dispersant and an antioxidant comprising an oil solubletrinuclear organomolybdenum compound of the generic formula (I): Mo3Sx-(Q),wherein x is from 4 to 10 and Q is a core group, which may be a ligand, and atleast one other compound selected from a phenolic and an aminic compound. Thecomposition is capable of controlling the viscosity of the lubricant in thepresence of soot and to retain the dispersancy of the dispersant. Thecompositions of the present invention minimise wear in engines and undesirableemission from exhaust caused by incomplete combustion from vehicles which usediesel engines and lubricants therefor. The combination of antioxidantsperform better at controlling soot induced viscosity increase than theindividual compounds.