A lubricating composition for use in heavy duty diesel engines which is formulated to allow the use of organomolybdenum compounds but which overcomes the issue of Cu and/or Pb corrosion. The lubricant is characterized by having a synergistic additive composition comprising (A) a sulfur-free organo-molybdenum compound, (B) a sulfur-containing organo-molybdenum compound and (C) a triazole derivative prepared by reacting 1,2,4-triazole, a formaldehyde source and an amine; (A), (B) and (C) being present in an amount sufficient to allow the lubricating composition to pass the High Temperature Corrosion Bench Test ASTM D 6594 with respect to Cu and/or Pb corrosion.

A lubricating composition for use in heavy duty diesel engines which is formulated to allow the use of organo-molybdenum compounds but which overcomes the issue of Cu and/or Pb corrosion and also maintains elastomer seal compatibility. The lubricant is characterized by having a composition comprising (A) an organo-molybdenum compound, (B) an alkylated diphenylamine derivative of triazole, (C) base oil, and optionally (D) one or more additives selected from the group including antioxidants, dispersants, detergents, anti-wear additives, extreme pressure additives, friction modifiers, rust inhibitors, corrosion inhibitors, seal swell agents, anti-foaming agents, pour point depressants and viscosity index modifiers.

A grease composition for constant velocity joints which comprises the following components: (a) a base oil, (b) a thickener, (c) a montan wax, (d) a zinc sulfonate, and (e) a sulfurized molybdenum dialkyldithiocarbamate.

The present invention provides a lubricating oil composition having fuel saving properties and providing gears and bearings with satisfactory durability, which is thus suitably used particularly for a gear system of an automobile. The lubricating oil composition a lubricating base oil comprising a mix base oil of (A) a mineral base oil having a 40 C. kinematic viscosity of 10 mm.sup.2/s or higher and 100 mm.sup.2/s or lower and (E) a mineral base oil having a 40 C. kinematic viscosity of 200 mm.sup.2/s or higher and 600 mm.sup.2/s or lower and a sulfur content of 0.3 to 0.9 percent by mass, the content of the base oil belonging to Component (B) is 15 percent by mass or more, and (C) and an organic molybdenum compound in an amount of 100 to 1000 ppm by mass as molybdenum, the lubricating oil composition having a 40 C. kinematic viscosity of 90 mm.sup.2/s or lower.

A lubricating oil composition which can reduce the occurrence frequency of LSPI and which can ensure detergency. The lubricating oil composition which includes a lubricant base oil, a compound having calcium and/or magnesium, a compound having molybdenum and/or phosphorus, and an ashless dispersant having nitrogen and which satisfies X0.85 and Y0.18 (wherein X is calculated according to formula (1): X=([Ca]+0.5[Mg])8[Mo]8[P]30 and Y is calculated according to formula (2): Y=[Ca]+1.65[Mg]+[N]). The lubricating oil composition for use in an internal combustion engine, more particularly, a lubricating oil composition for use in a supercharged gasoline engine.

A method for reducing aqueous phase separation of an emulsion comprising ethanol-based fuel and a lubricating oil comprising molybdenum ester amide complex, comprising the step of adding to the lubricating oil a dispersant polyalkyl (meth) acrylate (DPMA) in an amount from about 0.01 to about 0.5% by weight of the lubricating oil, such that the weight ratio of molybdenum to DPMA is about 2.05 or less.

The invention provides a lubricating composition containing a -amino compound. The invention further relates to a method of lubricating an internal combustion engine by lubricating the engine with the lubricating composition. The invention further relates to the use of the -amino carbonyl compound as copper corrosion inhibitors, friction control agents, antiwear and/or extreme pressure agents.

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, an overbased detergent having a TBN greater than 225 mg KOH/g and a low-based/neutral detergent having a TBN up to 175 mg KOH/g. A total amount of calcium from the overbased and low-based/neutral detergent is greater than 1100 ppm to less than 2400 ppm by weight based on a total weight of the lubricating oil composition. 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 commercially available lubricating oil compositions.

A lubricating oil composition and method of operating a boosted internal combustion engine. The lubricating oil composition has not more than 150 ppm sodium and includes a major amount of a base oil and an additive composition that includes one or more overbased calcium-containing detergents having a total base number of greater than 225 mg KOH/gram, in an amount sufficient to provide greater than 1100 ppm by weight to less than 2400 ppm by weight of calcium to the lubricating oil composition, and one or more molybdenum-containing compounds in an amount sufficient to provide at least about 80 ppm by weight molybdenum to the lubricating oil composition, all based on the total weight of the lubricating composition. The oil and method may reduce low-speed pre-ignition events in the boosted internal combustion engine relative to a number of low-speed pre-ignition events in the same engine lubricated with a reference lubricating oil.

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-containing detergents having a TBN greater than 225 mg KOH/g and one or more magnesium-containing detergents. A total amount of calcium from the one or more overbased calcium-containing detergents is from 900 ppm to less than 2400 ppm by weight, and a total amount of magnesium from the one or more magnesium-containing detergents is from 50 ppm to 500 ppm by weight, both based on a total weight of the lubricating oil composition. The lubricating oil composition and the method of using it are effective to reduce low speed pre-ignition events in a boosted internal combustion engine lubricated with the lubricating oil composition.