Two-stroke cycle engines can be effectively lubricated by supplying to the engine a mixture of an oil of lubricating viscosity and a hydrocarbyl-substituted hydroxyaromatic carboxylic acid or an ester, unsubstituted amide, hydrocarbyl-substituted amide, ammonium salt, hydrocarbylamine salt, or monovalent metal salt thereof in an amount suitable to reduce piston deposits in said engine. The mixture supplied to the engine contains less than 0.06 percent by weight of divalent metals.
二冲程循环发动机可以通过向发动机供应一种具有润滑粘度的机油与烃基取代的羟基芳香族
羧酸或其酯、未取代的酰胺、烃基取代的酰胺、
铵盐、烃基胺盐或一价
金属盐的混合物来实现有效润滑,其用量应适合于减少所述发动机中的活塞沉积物。按重量计,供应给发动机的混合物中的二价
金属含量低于 0.06%。