Nippon Oil Company

Nippon Oil Corporation

Mitsuaki Ishimaru

Mineo Kagaya

Noboru Ishida

Shinichi Shirahama

Tooru Aoki

Hiroaki Ishii

A base oil for hydraulic oil suitably used for hydraulic systems having filters of which micropore diameter is 50 &#x3bc;m or less is disclosed. The disclosure also provides a hydraulic oil composition using the above base oil, especially a hydraulic oil composition suitably used for such as tractors, transmissions, and common systems thereof having the hydraulic systems. The base oil has mineral oil, and the mineral oil is defined by kinematic viscosity at 100&#xb0; C.: 1.5&#x2dc;6 mm/s, pour-point: &#x2212;10&#xb0; C. or less, viscosity index: 100 or more, % C: 70 or more, % C: 2 or less, and aniline point: 106&#xb0; C. or more, and the mineral base oil is treated by catalytic dewaxing process and/or contains tertiary carbon atoms at a ratio of 7.4% or more to the total carbon atoms.

Base oil for hydraulic oil and composition using the same

A lubricating oil for two-cycle engines, which comprises a polyoxyalkylene glycol derivative represented by the following formula as a base oil, can be used to lubricate bearing portions and frictional portions of an two-cycle engine, so that the engine can be remarkably improved in generation of smoke, starting performance, cleanliness to prevent its exhaust system from clogging with carbon, cleanliness at high- or low temperature, and anti-seizure performance. ##STR1##

Lubricating oil for two-cycle engines

A method of making a novel lubricant additive comprising a boric acid modified aminoamide compound is disclosed. A lubricating oil composition incorporating the modified aminoamide compound is also disclosed, which exhibits enhanced high-temperature cleanliness when used particularly for two stroke cycle engines.

Lubricant additive

The lubricating oil composition of the present invention comprising an ester mixture as the main ingredient consisting of (A) 60-95% by weight of an ester of a hindered alcohol with a straight-chain saturated fatty acid having 8-12 carbon atoms, and (B) 5-40% by weight of a complex ester of a hindered alcohol with a straight-chain saturated fatty acid having 8-12 carbon atoms and also with a dibasic acid having 20-50 carbon atoms, the composition having excellent performances such as biodegradability, high-temperature engine cleanliness, lubricity and piston seizure preventiveness which are conductive to environmental protection.

Lubrication oil composition

A two-cycle engine oil composition comprising:

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Yokohama, Japan

Mitsuaki Ishimaru