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US 10,377,963 B2Granted
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.
Claims16
A lubricating oil composition comprising:
- greater than 50 wt. % of a base oil of lubricating viscosity;
- one or more borated compound(s) in an amount sufficient to provide 240 ppm by weight to 300 ppm by weight of boron to the lubricating oil composition;
- an organo-molybdenum nitrogen complex in an amount sufficient to provide 80 ppm by weight to 730 ppm by weight of molybdenum to the lubricating oil composition, based on a total weight of the lubricating composition;
- one or more magnesium sulfonate detergent(s) in an amount sufficient to provide 140 ppm by weight to 550 ppm by weight of magnesium to the lubricating oil composition;
- one or more overbased calcium sulfonate detergent(s) having a total base number greater than 225 mg KOH/g, measured by the method of ASTM D-2896, in an amount sufficient to provide 1340 ppm by weight to 1500 ppm by weight of calcium to the lubricating oil composition, based on the total weight of the lubricating composition,
- a total amount of calcium from calcium-containing detergents of 1340 ppm to not more than 1500 ppm,
- the total base number of the lubricating oil composition is from 6.0 mg KOH/g to 12.0 mg KOH/g, measured by the method of ASTM D-2896,
- the ratio of total calcium in ppm in the lubricating oil composition to total boron in ppm in the lubricating oil composition is 4.97-6.0;
- and
- wherein the lubricating oil composition comprises not more than 10 wt. % of a Group IV base oil, a Group V base oil, or a combination thereof.
7 more elements
Dependencies are inferred from the claim text.