LUBRICATING OIL COMPOSITION CONTAINING TWO MOLYBDENUM ADDITIVES

摘要

A lubricating oil composition exhibiting improved fuel economy and wet clutc h friction properties, which comprises: a) an oil of lubricating viscosity; b) at least one calcium or magnesium overbased detergent; c) an oil soluble dimeric molybdenum compound; d) an oil soluble organic trinuclear molybdenum compound; e) at least one zinc dihydrocarbyldithiophosphate compound, wherein the composition has a TBN of at least 3.6 from the calcium or magnesium overbased detergent, a NOACK volatility of about 15 wt.% or less, molybdenum in an amount up to about 350 ppm from the trinuclear molybdenum compound, molybdenum in an amount up to 2,000 ppm from the dimeric molybdenum compound, and phosphorus in an amount up to about 0.1 wt.% from a zinc dihydrocarbyldithiophosphate compound.