| abstract |
A diesel fuel composition comprising as an additive an ester compound which is the reaction product of an optionally substituted polycarboxylic acid or an anhydride thereof (e.g. maleic anhydride substituted by a C20-24 hydrocarbyl substituent) and an alcohol of formula ROH, wherein R is an optionally substituted hydrocarbyl group (e.g. tetradecanol). The purpose is to combat deposits in a diesel engine, or to reduce the treat rate of other additives selected from lubricity improvers, corrosion inhibitors or cold flow improvers. |