abstract |
A method of removing deposits from a diesel engine, the method comprising burning in the engine a diesel fuel composition comprising an engine cleanse additive, wherein the engine cleanse additive is the product of a Mannich reaction between: (a) an aldehyde; (b) ammonia, hydrazine, or an amine; and (c) an optionally substituted phenol, in which the or each substituent of the phenol component (c) has a number average molecular weight of less than 400. (Automatic translation with Google Translate, without legal value) |