Lubricating Oil Composition and Method for Operating Automatic Transmission

摘要

A lubricating oil composition containing a bis-type alkenyl-substituted succinimide which is prepared by reaction of succinic anhydride substituted with 2-alkenyl group having a branched structure in &bgr;-position with alkylenepolyamine or a compound derived from the bis-type alkenyl-substituted succinimide by post-treatment in combination with a mixture of an overbased sulfonate having a C20-C24 alkyl group and an overbased salicylate having a C14-C18 alkyl group shows a high friction coefficient within a wide sliding velocity range and keeps its high anti-shudder performance for a long period of time.