Method of reducing intake valve deposits in a direct injection engine
AssigneeThe Lubrizol Corporation
InventorRaymond M. Calder
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Abstract
This invention relates to a method of reducing intake valve deposits in a direct injection engine, the method comprising lubricating the engine with a lubricating oil composition comprising a base oil mixture, the base oil mixture comprising (i) a Group III, a Group IV oil, or a mixture thereof, in combination with (ii) a synthetic ester oil, the weight ratio of (i) to (ii) being from about 0.2:1 to about 6:1.
Claims28
A method of reducing intake valve deposits in a direct injection engine, the method comprising lubricating the engine with a lubricating oil composition comprising a base oil mixture, the base oil mixture comprising (i) a Group III oil, a Group IV oil, or a mixture thereof, in combination with (ii) a synthetic ester oil, the weight ratio of (i) to (ii) being from about 0.2:1 to about 6:1.
A method of reducing intake valve deposits in a direct injection engine, the method comprising lubricating the engine with a lubricating oil composition comprising:
- a base oil mixture comprising a polyalphaolefin oil and a synthetic ester oil, the weight ratio of the polyalphaolefin oil to the synthetic ester oil being about 0.2:1 to about 6:1;
- and
- a polyisobutene substituted succinimide, the polyisobutene substituted succinimide being derived from a polyisobutene substituted succinic anhydride or acid and at least one polyamine, the ratio of succinic groups to equivalent weights of polyisobutene being in the range of about 0.9:1 to about 1.8:1, the number average molecular weight of the polyisobutene being in the range of about 750 to about 3000.
A method of reducing intake valve deposits in a direct injection engine, the method comprising lubricating the engine with a lubricating oil composition comprising:
- a base oil mixture comprising a polyalphaolefin oil and a synthetic ester oil, the weight ratio of the polyalphaolefin oil to the synthetic ester oil being about 0.2:1 to about 6:1;
- and
- a polyisobutene substituted succinimide, the polyisobutene substituted succinimide being derived from a polyisobutene substituted succinic anhydride or acid and at least one polyamine, the mole ratio of C═O from the polyisobutene substituted succinic anhydride to N from the polyamine being up to about 1.18:1, the number average molecular weight of the polyisobutene being in the range of about 750 to about 3000.
Dependencies are inferred from the claim text.