Lubricating oil composition

摘要

A lubricating oil composition comprising a Group II basestock and a neutral or overbased metal hydrocarbyl-substituted hydroxybenzoate detergent having a basicity index of less than 2.

主权项

1. A method of reducing asphaltene precipitation or ‘black paint’ formation in operation of a marine diesel trunk piston engine fuelled with a heavy fuel oil and lubricated with a lubricating oil composition having a compositional TBN of from about 20 to about 60 mg KOH/g and comprising a Group II basestock, the method including a step of adding metal hydrocarbyl substituted alkylsalycilate detergent wherein the hydrocarbyl group is a straight-chain alkyl group having 14 to 24 carbon atoms, having a bacisity index of not less than 1.0 and less than 1.5 to the Group II basestock.