Patent ID: 6346504
Filing Date: 2002-02-12
Classification: C10M,C10N

Abstract:
A method for lubricating a four-stroke engine, comprising utilizing an ester based lubricant comprising at least one ester of a satureated, branched chain aliphatic monohydric alcohol having at least 8 carbon atoms and a saturated, branched chain aliphatic monocarboxylic acid having at least 10 carbon atoms, said ester having:(a) a kinematic viscosity at 40Â° C. of above 10 cSt and at most 35 cSt; (b) a non-polarity index (NPI) NPI=total&it;â€ƒ&it;number&it;â€ƒ&it;of&it;â€ƒ&it;carbon&it;â€ƒ&it;atomsÃ—molecular&it;â€ƒ&it;weightnumber&it;â€ƒ&it;of&it;â€ƒ&it;carboxylate&it;â€ƒ&it;groupsÃ—100&it;â€ƒ&it;of&it;â€ƒ&it;least&it;â€ƒ&it;at&it;â€ƒ&it;100;â€ƒOF at least 100; (c) an evaporation loss according to Noacvk (determined according to European Standard CEC L-40-T-82) of at most 10%; and (d) a pour point below âˆ’30Â° C.