Shell Oil Comapny

Toyota Jidosha Kabushiki Kaisha

Shell Internationale Research Maatschappij, B.v.

Eiji Nagatomi

Yoshihiko Aihara

Kenji Ueno

Noriaki Shinoda

Koji Saito

Kiyonari Ishikawa

Keiichi Moriki

Joanna Griffiths

Tetsuo Wakizono

Shinoda Noriaki

Hiroshi Fujito

Robert Ian Taylor

The present invention provides an anti-wear compound selected from phosphorus compounds as represented by the following General Formula (2) or metal salts thereof as represented by the following General Formula (3).

Anti-wear agent and lubricating composition with superior anti-wear properties containing same

Dicyclopentadienyl molybdenum crosslinked complexes which can be represented by general formula (1) below are provided, the use thereof as friction-modifiers and lubricating compositions which contain these compounds are also provided In this formula X is the element oxygen or the element sulphur, Y is the element oxygen or Y is absent, and Rto Rare groups selected individually from the group comprising hydrogen, the methyl group and the ethyl group.

Organic molybdenum compounds and lubricating compositions which contain said compounds

The present invention provides dicyclopentadienyl molybdenum crosslinked complexes which can be represented by general formula (1) below, the use thereof as friction-modifiers and lubricating compositions which contain these compounds. In this formula X is the element oxygen or the element sulphur, Y is the element oxygen or Y is absent, and Rto Rare groups selected individually from the group comprising hydrogen, the methyl group and the ethyl group.

The present invention provides novel organic molybdenum compounds, the use thereof as friction-modifiers and lubricating compositions which contain said compounds. The organic molybdenum compounds can be represented by the general formula (1) which is indicated below, wherein Aand Aare heterocyclic rings which may have substituent groups.

Organic molybdenum compounds and oil compositions containing the same

The present invention provides a lubricating oil composition comprising a mixture of both a poly-alpha-olefin and an ester compound, the lubricating oil composition having an SAE viscosity grade of 75W-85, satisfying GL-5 in terms of API gear oil designation and having a viscosity index of 160 or more. The above mixture of the poly-alpha-olefin and ester compound is preferably contained in an amount of from 75 to 90 wt % with reference to the total amount of the lubricating oil composition. The poly-alpha-olefin is preferably a mixture of a poly-alpha-olefin having low viscosity of from about 3 to 6 mm/s at 100&#xb0; C. and a poly-alpha-olefin having high viscosity of from about 35 to 45 mm/s at 100&#xb0; C.

Lubricating oil composition

The present invention provides a molybdenum pentakis-alkylxanthate having general formula (1) which is indicated below. In this formula Rto Reach represent a group individually selected from linear chain or branched alkyl groups which have from 1 to 30 carbon atoms.

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Tokyo, Japan

Eiji Nagatomi