COMPOSITIONS, CONCENTRATES, LUBRICANT COMPOSITIONS AND METHODS FOR IMPROVING FUEL ECONOMY OF INTERNAL COMBUSTION ENGINES

摘要

Fuel economy of internal combustion engines, especially gasoline engines, is improved by lubricating such engines with lubricant compositions comprising A. at least one tartrate of the formula wherein each R is independently a hydrocarbon-based group and the sum of carbon atoms in both the R groups is at least about 8; and 13. at least one oil-soluble detergent and dispersant.