Patent ID: 8951944
Filing Date: 2015-02-10
Classification: C10M,C10N

Abstract:
1. A method of preparing a trunk piston marine engine lubricating oil composition for a medium-speed four-stroke compression-ignited marine engine having a TBN of 20 to 60 mg KOH/g, said method comprising blending (A) detergent additive, in a minor amount, consisting essentially of overbased metal hydrocarbyl-substituted hydroxybenzoate detergent dispersed in diluent basestock containing greater than or equal to 90% saturates and less than or equal to 0.03% sulphur, the detergent additive having a basicity index in the range of 3 to 6; with (B) an oil of lubricating viscosity containing greater than or equal to 90% saturates and less than or equal to 0.03% sulphur, in a major amount.