A lubricating oil composition and method of operating a boosted internal combustion engine. The lubricating oil composition includes greater than 50 wt. % of a base oil, one or more overbased calcium sulfonate detergent(s) and one or more overbased calcium phenate detergent(s). The calcium, boron, nitrogen, and amount of soap are maintained within certain ratios, and the total base number contribution from all detergents to the lubricating oil composition is less than 4.2 mg KOH/g of the lubricating oil composition, as measured by the method of ASTM D-2896. The lubricating oil composition and method may be effective to reduce low-speed pre-ignition events in a boosted internal combustion engine lubricated with the lubricating oil composition relative to capable lubricating oil compositions.

A lubricating oil composition and method of operating a boosted internal combustion engine with reduced low-speed pre-ignition events and corrosion resistance. The oil composition includes a base oil, one or more overbased calcium sulfonate detergents, one or more overbased calcium phenate detergents, and one or more overbased magnesium-containing detergents. A ratio of ppm of calcium to TBN of the oil composition is less than 170; a ratio of ppm of magnesium to total soap content in wt. % is greater than 700; and there are limited amounts of boron and molybdenum, and all weight percentages and ppm values being based on the total weight of the oil composition. The compositions give low LSPI ratios and pass the Ball Rust test.

A lubricating oil composition and method of operating a boosted internal combustion engine. The lubricating oil includes greater than 50 wt. % of a base oil, one or more overbased calcium-containing detergents, one or more overbased magnesium-containing detergents and one or more molybdenum compounds and leads to a more than 60% reduction in LSPI compared to the LSPI of a reference oil and passes the Ball Rust Test. The ratio of wt % calcium from the overbased detergents to wt. % of magnesium from the overbased detergents is less than 11.9. A ratio of total ppm of magnesium to total TBN of the lubricating oil in mg KOH/g is greater than 19. A ratio of the total ppm of calcium to the total TBN of the lubricating oil is less than 222. The oil and method may reduce low-speed pre-ignition events in a boosted internal combustion relative to commercially available lubricating oils.

A lubricating oil composition and method of operating a boosted internal combustion engine. The lubricating oil includes greater than 50 wt. % of a base oil, one or more overbased calcium-containing detergents, one or more overbased magnesium-containing detergents and one or more molybdenum compounds and leads to a more than 60% reduction in LSPI compared to the LSPI of a reference oil and passes the Ball Rust Test. The ratio of wt % calcium from the overbased detergents to wt. % of magnesium from the overbased detergents is less than 11.9. A ratio of total ppm of magnesium to total TBN of the lubricating oil in mg KOH/g is greater than 19. A ratio of the total ppm of calcium to the total TBN of the lubricating oil is less than 222. The oil and method may reduce low-speed pre-ignition events in a boosted internal combustion relative to commercially available lubricating oils.

The invention is directed to a zinc-free lubricating composition for an internal combustion engine containing a phosphorus anti-wear agent, an ashless antioxidant, and a metal-free basic detergent. The lubricating composition provides wear protection, deposit control, and improved acid control with reduced levels of metal-containing additives.

The invention is directed to a zinc-free lubricating composition for an internal combustion engine containing a phosphorus anti-wear agent, an ashless antioxidant, and a metal-free basic detergent. The lubricating composition provides wear protection, deposit control, and improved acid control with reduced levels of metal-containing additives.

The present disclosure relates to engine lubricating oil compositions and methods of lubricating a diesel internal combustion engine effective to achieve robust performance in both durability (i.e., piston cleanliness) and improved fuel economy. In one aspect, the engine lubricating oil compositions herein have a composition effective to achieve passing piston cleanliness pursuant to CEC L-117-20 (i.e., the VW TDi3 test) and to achieve a positive fuel economy increase as measured pursuant to JASO M 366, and preferably a fuel economy improvement as measured pursuant to JASO M 366 of at least about 0.5 percent. The engine lubricating oil compositions herein may have a viscosity grade of 0W-8, 0W-12, 0W16, and/or 0W-20.

The present disclosure relates to engine lubricating oil compositions and methods of lubricating a diesel internal combustion engine effective to achieve robust performance in both durability (i.e., piston cleanliness) and improved fuel economy. In one aspect, the engine lubricating oil compositions herein have a composition effective to achieve passing piston cleanliness pursuant to CEC L-117-20 (i.e., the VW TDi3 test) and to achieve a positive fuel economy increase as measured pursuant to JASO M 366, and preferably a fuel economy improvement as measured pursuant to JASO M 366 of at least about 0.5 percent. The engine lubricating oil compositions herein may have a viscosity grade of 0W-8, 0W-12, 0W16, and/or 0W-20.

Provided is a lubricating oil composition for an internal combustion engine containing: (A) a lubricant base oil with a kinematic viscosity at 100? C. of 2.0 mm.sup.2/s to 5.0 mm.sup.2/s; (B) 50 mass ppm to 2000 mass ppm of a molybdenum-based friction modifier based on the total amount of the composition as an amount of molybdenum; (C) a nitrogen-containing ashless friction modifier; (D) a succinimide or a derivative thereof as a dispersant; (E) an amine ashless antioxidant as an antioxidant; and (F) 1000 mass ppm to 2200 mass ppm of a metallic detergent based on the total amount of the composition as an amount of metal, wherein the amount of sulfated ash in the composition is 0.9 mass % or less, and a nitrogen management index is 0.60 or less. Provided is a lubricating oil composition for an internal combustion engine having improved fuel efficiency and oxidative stability, while maintaining low amount of sulfated ash.

Provided is a lubricating oil composition for an internal combustion engine containing: (A) a lubricant base oil with a kinematic viscosity at 100? C. of 2.0 mm.sup.2/s to 5.0 mm.sup.2/s; (B) 50 mass ppm to 2000 mass ppm of a molybdenum-based friction modifier based on the total amount of the composition as an amount of molybdenum; (C) a nitrogen-containing ashless friction modifier; (D) a succinimide or a derivative thereof as a dispersant; (E) an amine ashless antioxidant as an antioxidant; and (F) 1000 mass ppm to 2200 mass ppm of a metallic detergent based on the total amount of the composition as an amount of metal, wherein the amount of sulfated ash in the composition is 0.9 mass % or less, and a nitrogen management index is 0.60 or less. Provided is a lubricating oil composition for an internal combustion engine having improved fuel efficiency and oxidative stability, while maintaining low amount of sulfated ash.