Abstract:
A fuel composition for internal combustion engines, and more particularly, a fuel composition for internal combustion engines containing less than about 0.5 gram of lead per gallon of fuel is described. The fuel provides acceptable valve seat protection in engines designed to operate on leaded or unleaded fuels. Ordinarily, leaded fuels contain components to reduce deposits within the engine cylinders which unleaded fuels do not. As leaded fuels become unavailable, some refiners will add valve protecting components to the unleaded fuels to satisfy the leaded market. Such fuels will then potentially cause an increase in the octane requirement. This invention deals with polybasic carboxylate additives having valve seat protection properties which avoid or minimize the octane requirement increase.
Abstract:
Gasoline compositions and additive mixtures of carboxymethoxysuccinic acid, its salts, esters, or other derivatives in amount sufficient to alleviate the plugging of certain catalysts being used in an engine exhaust system to lower the amount of undesirable constituents in exhaust gas from an engine being operated on gasoline containing a cyclopentadienyl manganese antiknock.
Abstract:
Gasoline compositions and additive mixtures containing compounds having the formula ##STR1## wherein R.sub.1 -R.sub.3 and R'-R'" are each independently selected from hydrogen, hydrocarbyl radicals, and substituted hydrocarbyl radicals, in an amount sufficient to alleviate the plugging of certain catalysts being used in an engine exhaust system to lower the amount of undesirable constituents in exhaust gas from an engine being operated on gasoline containing a cyclopentadienyl manganese antiknock.