Low ash stationary gas engine lubricant
AssigneeThe Lubrizol Corporation
InventorsW. Barnes, Virginia Carrick, Sara Pocinki, Jayram Patel
Life of this patent
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Abstract
A low-ash, low-phosphorus lubricant composition suitable for use in a stationary gas engine includes an oil of lubricating viscosity, 1.5 to 8 percent of a succinimide dispersant, 0.8 to 4.0 percent of a hindered, ester-substituted phenol antioxidant, and at least one metal-containing sulfonate detergent or metal-containing phenate detergent, in an amount which provides 1.1 to 2.1 percent by weight of said sulfonate or phenate moieties exclusive of the weight of the metal moieties. The lubricant contains up to 0.08 percent by weight phosphorus and up to 1.25 percent sulfated ash.
Claims12
A low-ash, low-phosphorus lubricant composition suitable for use in a stationary gas engine, comprising:
- (a) an oil of lubricating viscosity;
- (b) about 1.5 to about 8 percent by weight of a succinimide dispersant;
- (c) about 0.8 to about 4.0 percent by weight of a hindered, ester-substituted phenol antioxidant;
- and
- (d) at least one metal-containing sulfonate detergent or metal-containing phenate detergent, in an amount which provides 1.1 to 2.1 percent by weight of said sulfonate or phenate moieties exclusive of the weight of the metal moieties;
- said lubricant containing up to about 0.08 percent by weight phosphorus and up to about 1.25 percent sulfated ash.
A method of lubricating a stationary gas engine, comprising supplying to said engine a low-ash, low-phosphorus lubricant composition comprising:
- (a) an oil of lubricating viscosity;
- (b) about 1.5 to about 8 percent by weight of a succinimide dispersant;
- (c) about 0.8 to about 4.0 percent by weight of a hindered, ester-substituted phenol antioxidant;
- and
- (d) at least one metal-containing sulfonate detergent or metal-containing phenate detergent, in an amount which provides 1.1 to 2.1 percent by weight of said sulfonate or phenate moieties exclusive of the weight of the metal moieties;
- said lubricant containing up to about 0.08 percent by weight phosphorus and up to about 1.25 percent sulfated ash.
Dependencies are inferred from the claim text.