Lubricating oil composition containing an additive anti - friction and its application to reduce the friction in an internal combustion engine

摘要

A lubricating oil composition having improved friction reducing properties comprises a major amount of weight of lubricating base oil and from 0.01 to 5.0% by weight of at least one oil-soluble hydroxyl terminated polymer of butadiene and/or styrene- butadiene. Preferably the number average molecular weight of the polymer(s) in from 100 to 10,000, more especially 1,000 to 6,000. Preferred polymers are those having the structures IMAGE where n is from 2 to 100.0