Patent ID: 8084404
Filing Date: 2011-12-27
Classification: C10M,C10N

Abstract:
1. A silver bearing protection locomotive diesel engine crankcase lubricating oil composition comprising: (A) a major amount of an oil of lubricating viscosity; (B) a silver wear protection additive composition comprising a mixture of (i) a hydrocarbylamine salt of a di-alkyl di-thiophosphoric acid and (ii) a hydrocarbylamine salt of an alkyl acid phosphate in the range of from about 0.1 weight percent to about 1.0 weight percent based on the total weight of the lubricating oil composition, wherein the hydrocarbyl group on the hydrocarbylamine is an aliphatic group selected from an alkyl group or an alkenyl group; and (C) about 1.0 weight percent to about 10 weight percent of a mixture of a medium overbased sulfurized calcium alkyl phenate and a high overbased sulfurized, carbonated calcium alkyl phenate based on the total weight of the lubricating oil composition, wherein the high overbased sulfurized, carbonated calcium alkyl phenate has a total base number greater than 200.