A refrigerating oil comprising a lubricating base oil, a first extreme pressure agent containing sulfur and phosphorus as constituent elements and a second extreme pressure agent containing phosphorus but not containing sulfur as constituent elements, and having a kinematic viscosity at 100 C. of 0.5 mm.sup.2/s or more and 2.5 mm.sup.2/s or less.

The present invention relates to a lubricant composition, and more particularly to a lubricant composition, which has superior oxidation stability and friction characteristics even under harsh conditions of high temperature and high pressure and is thus suitable for use in hydraulic oil. The lubricant composition of the present invention includes a base oil, a liquid olefin copolymer, a phosphorothioate compound, and phosphonium phosphate.

A composition having a compound having the structure: ##STR00001##
wherein each R is an independently selected alkylphenol-free moiety that is a C.sub.1-20 alkyl, C.sub.2-22 alkenyl, C.sub.6-40 cycloalkyl, C.sub.7-40 cycloalkylene, C.sub.3-20 methoxy alkyl glycol ether, C.sub.3-20 alkyl glycol ether, or YOH moiety; wherein each Y is an independently selected alkylphenol-free moiety that is a C.sub.2-40 alkylene, C.sub.7-40 cycloalkylene, or C.sub.3-40 alkyl lactone moiety; wherein m is an integer ranging from 1 to 100; and wherein x is an integer ranging from 1 to 1000.

A method having the step of using a compound as an additive for: gear oil, grease, engine oil, combustion-engine lubricant, automatic transmission fluid, two-cycle engine lubricant, marine-engine lubricant, or anti-wear agent, the compound having the structure:

##STR00001##

wherein each R is an independently selected alkylphenol-free moiety that is a C.sub.1-22 alkyl, C.sub.6-40 cycloalkyl, C.sub.3-20 methoxy alkyl glycol ether, C.sub.3-20 alkyl glycol ether, or YOH moiety; wherein each Y is an independently selected alkylphenol-free moiety that is a C.sub.2-40 alkyl, C.sub.6-40 cycloalkyl, C.sub.2-20 alkyl glycol ether, or C.sub.3-40 alkyl lactone moiety; wherein each m is an independently selected integer ranging from 1 to 100; and wherein x is an integer ranging from 1 to 1000.

Provided are a lubricating oil composition containing a base oil and a specific thiophosphate compound (A) and not substantially containing a molybdenum-based, and a precision reduction gear using the lubricating oil composition. The lubricating oil composition and the precision reduction gear using it exhibit excellent wear resistance and can prevent sludge generation in a broad range of contact pressures ranging from high to low.

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 formula I below: ##STR00001##
esterified (per OH basis) with 25 to 100% isobutyric acid and 0 to 75% 3,5,5-trimethylhexanoic acid, wherein R is a H, methyl, ethyl, isopropyl, or isobutyl, and (ii) a minor amount of at least one amine phosphate ashless antiwear additive.

Ethylene-C.sub.3-C.sub.10 alpha olefin copolymers, dispersants and lubricating oils/fuel compositions incorporating dispersants, and related methods are generally described herein. The copolymer may comprise ethylene-derived units and C.sub.3-C.sub.10 alpha-olefin-derived units. The C.sub.3-C.sub.10 alpha-olefin-derived units may have a carbon number from three to ten. For example, the C.sub.3-C.sub.10 alpha-olefin-derived units may be propylene-derived units.

The invention relates to phosphorous-containing compounds useful as antiwear additive components, lubricant additive compositions and lubricant compositions each comprising such compounds, methods for making and using the same, including methods of lubricating machines and machine parts and methods of extending the useful life of elastomeric seal components of such machines.

An oil-soluble ashless antiwear additive and a lubricating composition including the ashless antiwear additive having improved copper corrosion performance obtained by reacting an organic hydroxy compound with phosphorus pentasulfide to form a reaction product, distilling the reaction product and recovering a condensate, and reacting the condensate with an unsaturated carboxylic acid to form an oil-soluble phosphorus antiwear additive.

The present disclosure relates to lubricating oil compositions, and in particular, lubricating oil compositions for slideway applications, additive compositions for the slideway lubricants, and methods of lubricating a machine part, such as a slideway with the lubricating oil compositions. In one aspect, the lubricating oil compositions have a composition that provides both good friction performance and good separability from metal working fluids at the same time.