Patent ID: 8268760

Claim:
A method for reducing friction and wear in internal combustion engines lubricated with a lubricating oil comprising a base oil and an additive amount of at least one additive selected from anti-oxidant, anti-wear, detergent or dispersant by the addition to the lubricating oil of an additive amount of one or more ionic liquids comprising, (a) heating the ionic liquid alone to a temperature of from 30 to 120° C., (b) adding to the heated ionic liquid a zinc or molybdenum dialkyl dithiophosphate or zinc or molybdenum dialkyl dithiocarbamate, (c) heating the mixture of (b) to a temperature between 50 to 120° C. for a time sufficient for the ionic liquid and the zinc or molybdenum dialkyl dithiophosphate or dialkyl dithiocarbamate to interact, and (d) adding resulting compound from (c) into base oil to make the lubricating oil.