Patent ID: 8084403

Claim:
A lubricant composition for reducing engine deposits comprising: (a) a base oil having a NOACK volatility of from about 5 to about 15; and (b) a zinc dialkyl dithio phosphate composition comprising at least about 65 mole percent of zinc dialkyl dithio phosphate compounds derived from all primary alcohols, wherein the zinc dialkyl dithio phosphate composition comprises greater than about 40 mole percent zinc dialkyl dithio phosphate compounds having alkoxy moieties derived from primary alcohols having four carbon atoms and at least 15 mole percent of zinc dialkyl dithio phosphate compounds having alkoxy moieties derived from primary alcohols having five carbon atoms and wherein the average number of carbon atoms in the zinc dialkyl dithio phosphate composition is greater than about 9.0 and the zinc dialkyl dithio phosphate provides from about 0.01 to about 0.15 wt. % phosphorus to the lubricant composition.