Lubricants for use in boosted engines
AssigneeAfton Chemical Corporation
InventorsKongsheng Yang, Kristin Fletcher, William Y. Lam, Jeremy Styer
Life of this patent
Estimating the term…
Abstract
A lubricating oil composition and method of operating a boosted internal combustion engine. The lubricating oil composition is formulated to be resistant to turbocharger deposit formation in the boosted internal combustion engine, as shown by its ability to ensure a TCO Temperature Increase of less than 9.0% as measured using the 2015 version of the General Motors dexos1® Turbocharger Coking Test. The lubricating oil composition may also have a low NOACK volatility, as measured by the method of ASTM D-5800 at 250° C.
Claims22
A lubricating oil composition comprising:
- greater than 50 wt. % of a base oil of lubricating viscosity and one or more metal-containing detergent(s);
- wherein a ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total nitrogen in ppm in the lubricating oil composition is less than 1.9;
- a ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total boron in ppm in the lubricating oil composition is less than 7.5;
- and
- a ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total molybdenum in ppm in the lubricating oil composition is less than 23.8;
- the lubricating oil composition has a NOACK volatility as measured by the method of ASTM D-5800 at 250° C. of less than 11.0 wt. %, and the lubricating oil composition is effective to ensure a TCO Temperature Increase of less than 9.0% as measured using the 2015 version of the General Motors dexos1® Turbocharger Coking Test.
A lubricating oil composition comprising:
- greater than 50 wt. % of a base oil of lubricating viscosity;
- one or more borated compound(s);
- one or more molybdenum-containing compound(s) in an amount sufficient to provide greater than about 40 ppm by weight molybdenum to the lubricating oil composition, based on a total weight of the lubricating composition;
- one or more magnesium-containing detergent(s);
- one or more overbased calcium-containing detergent(s) in an amount sufficient to provide less than about 1800 ppm by weight calcium to the lubricating oil composition, based on the total weight of the lubricating composition.
Dependencies are inferred from the claim text.