Lubricating oil composition

Details Lubricating oil composition Lubricating oil composition

C - Chemistry, Metallurgy

10

M

C10M 141/00 (2006.01) C10M 135/18 (2006.01) C10M 137/10 (2006.01) C10M 141/10 (2006.01) C10M 141/12 (2006.01)

Patent

CA 2185716

Disclosed herein is a lubricating oil composition containing a major portion of a lubricating base oil and a minor portion of additives compris- ing a zinc di (primary alkyl) dithiophosphate and a zinc di (secondary alkyl) dithiophosphate in proportions to give a weight ratio in phosphorus content of from 20:80 to 80:20, a sulfur compound in a proportion to give a sulfur content of from 300 to 1,200 ppm (weight basis), and an oxymolybdenum sulfide dithio- carbamate or an oxymolybdenum sulfide dithiophosphate in a proportion to give a molybdenum content of from 200 to 2,000 ppm (weight basis). The lubricating oil composition according to the present invention has excellent antiwear properties and even at elevated temperatures and in the presence of nitrogen oxides, exhibits high oxidation resistance and retains goodfriction-reducing properties, so that it can be suitably used as a lubricating oil for internal combustion engines.

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