The present disclosure is directed to a marine cylinder lubricant composition which is devoid of Bright Stock and is effective to provide the desired viscosity at high working temperatures and also sufficiently fluid to spread over the entire working surfaces of marine cylinder to form a good adsorbed oil film. ...

The present disclosure is directed to an additive composition for engine oils comprising;(a) an alkenyl-substituted succinic anhydride and (b) a polyamine compound and (C) Co-additives, wherein the reaction product has a ratio of the amide to imide infrared absorption peak areas of about 1:1.2to aboutl.6.The said re...