| abstract |
ABSTRACT A fuel composition for internal combustion engines is disclosed. The composition comprises a major amount of a liquid hydrocarbon fuel, containing less than about 0.5 grams of lead per liter of fuel, and a minor amount of (A) at least one hydrocarbon-soluble alkaline metal or alkaline earth metal salt of a sulfur acid, a carboxylic acid or a phenol, (B) at least one hydrocarbon-soluble ashless dispersant, present an amount sufficient to reduce valve seat recession when the fuel is used in an internal combustion engine. Fuel compositions according to the invention act not only to control valve seat recession, but also to reduce and modify deposit formation, and thereby enhance engine combustion. |