Chevron Oronite Technology B.v.

Bertus Bernardus Hoogendam

Richard Hogendoorn

Disclosed herein is lubricating oil composition for providing enhanced piston cleanliness in an internal combustion engine. The lubricating oil composition includes (a) greater than 65 wt. %, based on the total weight of the lubricating oil composition, of a base oil component having a Kv at 100&#xb0; C. of about 3.5 to about 4.5 cSt; (b) about 3.0 wt. % to about 10 wt. %, based on the total weight of the lubricating oil composition, of at least one Mannich reaction product prepared by the condensation of a polyisobutyl-substituted hydroxyaromatic compound, wherein the polyisobutyl group is derived from polyisobutene containing at least about 70 wt. % methylvinylidene isomer and has a number average molecular weight of from about 400 to about 2,500, an aldehyde, an amino acid or ester derivative thereof, and an alkali metal base; and (c) at least one ashless dispersant other than component (b); wherein the lubricating oil composition has a sulfur content of less than or equal to about 0.30 wt. %, a phosphorus content of less than or equal to about 0.09 wt. %, and a sulfated ash content of less than or equal to about 1.60 wt. % as determined by ASTM D 874, based on the total weight of the lubricating oil composition; and further wherein the lubricating oil composition is a SAE 0W multi-grade lubricating oil composition.

Lubricating oil compositions with enhanced piston cleanliness

Disclosed herein is lubricating oil composition for providing enhanced piston cleanliness in an internal combustion engine. The lubricating oil composition include (a) from about 50 to about 65 wt. %, based on the total weight of the lubricating oil composition, of a first base oil component having a Kv at 100&#xb0; C. of about 3.5 to about 4.5 cSt; (b) from about 10 to about 30 wt. %, based on the total weight of the lubricating oil composition, of a second base oil component having a Kv at 100&#xb0; C. of about 5.5 to about 6.5 cSt; (c) about 1.50 wt. % to about 10 wt. %, based on the total weight of the lubricating oil composition, of at least one Mannich reaction product as disclosed herein; and (d) at least one ashless dispersant other than component (c); wherein the lubricating oil composition has a sulfur content of less than or equal to about 0.30 wt. %, a phosphorus content of less than or equal to about 0.09 wt. %, and a sulfated ash content of less than or equal to about 1.60 wt. % as determined by ASTM D 874, based on the total weight of the lubricating oil composition; and further wherein the lubricating oil composition is a SAE 0W multi-grade lubricating oil composition; with the proviso that when the lubricating oil composition has a sulfated ash content of less than or equal to 0.60 wt. %, based on the total weight the lubricating oil composition, the Mannich reaction product is present in at least about 3.0 wt. %, based on the total weight of the lubricating oil composition.

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Rotterdam, Netherlands

Bertus Bernardus Hoogendam