| 摘要 |
Distillate fuels and additive concentrates comprising (a) a detergent/dispersant prepared by reacting (i) a polyamine, eg triethylene tetramine or a combination of ethylene polyamines, which approximate triethylene tetramine, with (ii) at least one acyclic hydrocarbyl-substituted succinic acylating agent characterized by having an acid number in the range of 0.7 to 1.1. and by having a substituent containing an average of 50 to 100 carbon atoms; and (b) a mineral oil, eg napthenic or asphaltic oils, having a viscosity index of less than about 90 and a volatility of less than 50% as determined by a method disclosed, are particularly effective in reducing the amount of induction system deposits formed in an engine under normal service conditions. The detergent/dispersant contains in its molecular structure in chemically combined form an average of from 1.5 to 2.2 moles of (ii) per mole of (i). |
