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, wherei n 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.