Provided is a grease composition including a base oil (A) containing an alkyl naphthalene (A1) and an aliphatic diurea (B) represented by general formula (b1):

R.sup.1NHCONHR.sup.3NHCONHR.sup.2(b1)

(wherein, R.sup.1 and R.sup.2 each independently represent a monovalent aliphatic hydrocarbon group having 9 to 20 carbon atoms, and R.sup.3 represents a divalent aromatic hydrocarbon group having 6 to 18 carbon atoms),

wherein a content of the aliphatic diurea (B) is 20 to 30% by mass based on a total amount of the grease composition.

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.

Lubricant compositions include copolymers of monomers selected from C6-C10 alkyl methacrylate monomers, and monomers selected from C10-C18 alkyl methacrylate monomers, and a base oil or comprising a copolymer obtained by combining at least monomers selected from C6-C10 alkyl methacrylate monomers, and monomers selected from C10-C18 alkyl methacrylate monomers in a mixture and co-polymerizing the monomers. The methods for the preparation of the lubricant compositions, and lubricants uses.

The invention provides a method for improving the air release of a lubricating oil as measured by ASTM D3427. The method comprises a step of mixing an additive into the lubricating oil.

Provided is a lubricant composition including a bicyclic liquid crystal of formula (1), tricyclic liquid crystal compounds of formula (2), and formula (3). The composition is suitable for use in a clean environment, under a high vacuum, under high temperature and a bearing. ##STR00001##
R.sup.1 and R.sup.2 are the same or different from each other, and each is OCH.sub.2CH.sub.2CH(R)CH.sub.2CH.sub.2OR. ##STR00002##
R.sup.11 and R.sup.21 are the same or different from each other, and each is OR. R.sup.12, R.sup.13, R.sup.22 and R.sup.23 are the same or different from each other, and each is hydrogen or a group OR. ##STR00003##
R.sup.31 and R.sup.41 are the same or different from each other, and each is OCH.sub.2CH.sub.2CH(R)CH.sub.2CH.sub.2OR. R.sup.32, R.sup.33, R.sup.42, and R.sup.43 are the same or different from each other, and each is hydrogen or OCH.sub.2CH.sub.2CH(R)CH.sub.2CH.sub.2OR. R is a linear or branched C.sub.nH.sub.2n+1, 1?n?20, and R is methyl or ethyl.

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 lubricant composition comprising from 75 to 95 percent by weight polyalphaolefin base oil; and from 7.5 to 25 percent by weight oil soluble polyalkylene glycol (OSP) additive, wherein the polyalkylene glycol has a viscosity at 40 C. from 15 cSt to 50 cSt and comprises units derived from propylene oxide and units derived from butylene oxide; wherein the lubricant composition exhibits a four ball EP weld load result of at least 160 kg and an air release value at 75 C. of less than 3 minutes is provided.

A method for preventing or reducing engine knock or pre-ignition in a high compression spark ignition engine lubricated with a lubricating oil by introducing to a combustion chamber of the engine from 0.1 to 5% by volume of the gasoline used a lubricating oil as a formulated oil, said formulated oil having a composition comprising (i) a major amount of a lubricating oil base stock comprising at least 80% by weight of one branched ester having at least 15% of the total carbons in the form of methyl groups, and (ii) a minor amount of at least one ashless amine phosphate antiwear additive. Also provided is a lubricating engine oil for high compression spark ignition engines including (i) a major amount of a lubricating oil base stock comprising at least 80% by weight a trimethylol propane ester of 50:50 mixture of isobutyric acid and 3,5,5-trimethylhexanoic acid and (ii) a minor amount of at least one amine phosphate ashless antiwear additive.

A hydraulic fluid comprising a biobased base oil having hydrolytic stability.

Lubricating compositions are provided. The lubricating compositions can include a lubricating agent, a flexibilizer, a dispersing agent, and a charge imparting agent. The lubricating compositions can optionally include a carrier.