Zinc-free lubricating composition
AssigneeThe Lubrizol Corporation
InventorsMichael R. Sutton, Paul R. Vincent
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Abstract
The invention is directed to a zinc-free lubricating composition for an internal combustion engine containing a phosphorus anti-wear agent, an ashless antioxidant, and an oxyalkylated phenol compound. The lubricating composition provides wear protection, deposit control, and improved acid control with reduced levels of metal-containing additives.
Claims12
A zinc-free lubricating composition comprising:
- (a) an oil of lubricating viscosity;
- (b) a zinc-free phosphorus-containing antiwear agent;
- (c) at least one oxyalkylated hydrocarbyl phenol substituted with at least one aliphatic hydrocarbyl group of 1 to 250 carbon atoms;
- and
- (d) a sulfurized phenol or sulfur-substituted phenol ashless antioxidant.
A method of lubricating an internal combustion engine comprising lubricating the engine with a lubricant composition comprising (a) an oil of lubricating viscosity, (b) a zinc-free phosphorus-containing antiwear agent, (c) at least one oxyalkylated hydrocarbyl phenol that is substituted with at least one aliphatic hydrocarbyl group of 1 to 250 carbon atoms, and (d) a sulfurized phenol or sulfur-substituted phenol ashless antioxidant.
Dependencies are inferred from the claim text.