Nippon Oil Corporation

Petroleum Energy Center

Nippon Mitsubishi Oil Corporation

Toyota Jidosha Kabushiki Kaisha

Jtekt Corporation

Osamu Kurosawa

Masato Takahashi

Toshiyuki Saito

Shigeki Matsui

Takashi Sano

Shinichi Shirahama

Kazuo Tagawa

Kazuhiro Yagishita

Junji Ando

Toshifumi Sakai

Masahiro Taguchi

Shozaburo Konishi

Masaaki Itou

Akihiko Ichikawa

Hitoshi Komatsubara

Jinichi Igarashi

Hajime Fukami

Izuru Sugiura

Kenichi Komiya

Yoshikazu Yamamoto

Hisayuki Wada

Koji Saito

Yoko Matsuyama

Kazuo Yamamori

Toru Matsuoka

Kai Fu

Tetuzo Yoneda

Tooru Matsuoka

Mototake Furuhashi

The lubricating base oil of the invention is characterized by satisfying at least one of the following conditions (a) or (b).

Lubricant base oil, lubricant composition for internal combustion engine and lubricant composition for driving force transmitting device

The present invention provides a lubricating oil composition which is less in evaporation loss even having a low viscosity and excellent in lubricating properties such as low-temperature viscosity characteristics and anti-seizure properties and in oxidation stability, suitable for use in engines, automatic transmissions, manual transmissions, final reduction gear units, and continuously variable transmissions. The lubricating oil composition comprises (A) a lubricating base oil and (B) a poly(meth)acrylate additive in such an amount that the kinematic viscosity at 100&#xb0; C. of the composition (Vc) is from 3 to 15 mm/s, the viscosity index of the composition is from 95 to 200, and the ratio of the kinematic viscosity at 100&#xb0; C. of (A) the lubricating base oil (Vb) to (Vc) (=Vb/Vc) is 0.60 or greater, further, (C) a metallic detergent, (D) an ashless dispersant and (E) zinc dithiophosphate, each in a specific amount.

Lubricating oil composition

The present invention provides a lubricating base oil comprising saturated components of 90% by mass or greater, wherein the proportion of cyclic saturated components among the saturated components is not greater than 40% by mass, and by having a viscosity index of 110 or higher and an iodine value of not greater than 2.5. The lubricating base oil of the invention exhibits excellent viscosity-temperature characteristics and heat and oxidation stability while also allowing additives to exhibit a higher level of function when additives are included. The lubricating base oil of the invention is suitable for use in various lubricating oil fields, and is especially useful for reducing energy loss and achieving energy savings in devices in which the lubricating base oil is applied.

Lube base oil, process for production thereof, and lubricating oil composition

The lubricating base oil of the invention satisfies at least one of conditions (a) or (b) below. The lubricating oil composition for an internal combustion engine according to the invention comprises the lubricating base oil of the invention, an ashless antioxidant containing essentially no sulfur as a constituent element, and at least one compound selected from among ashless antioxidants containing sulfur as a constituent element and organic molybdenum compounds. Also, a lubricating oil composition for a power train device according to the invention comprises the lubricating base oil of the invention, a poly(meth)acrylate-based viscosity index improver and a phosphorus-containing compound.

Lube base oil, lubricating oil composition for internal combustion engine, and lubricating oil composition for drive transmission device

Provided is a lubricating oil composition for manual transmissions which has anti-seizure properties for shift forks and can provide manual transmissions with excellent shifting characteristics though it has a low viscosity and can save fuel to be used in automobiles. The lubricating oil composition for manual transmissions comprises a lubricating base oil with a kinematic viscosity at 100&#xb0; C. of 4 to 6 mm/s, on the basis of the total mass of the composition, (A) 0.14 to 0.20 percent by mass in terms of magnesium of magnesium sulfonate, (B) 0.14 to 0.18 percent by mass in terms of zinc of a specific zinc dithiophosphate, (C) 0.3 to 0.5 percent by mass in terms of sulfur of a sulfur-containing extreme pressure additive other than zinc dithiophosphate, and (D) 0.02 to 0.05 percent by mass in terms of phosphorus of an alkyl phosphite, and having a kinematic viscosity at 40&#xb0; C. of 25 to 30 mm/s.

Lubricating oil composition for manual transmission

Lubricant compositions comprise a lubricant base oil, and (A) a mono substituted amide type bissuccinimide in an amount from 0.5 to 20 percent by mass, (B) zinc dithiophosphate in an amount from 0.05 to 0.3 percent by mass of phosphorus, and (C) a metal-based detergent in an amount form 0.5 to 4.0 percent by mass of sulfated ash, based on the total mass of the composition. Lubricant compositions preferably further comprises (D) a dispersant type viscosity index improver in an amount from 0.1 to 20 percent by mass, based on the total mass of the composition.

Lubricant compositions

A lubricating oil composition having an excellent sludge formation inhibiting effect and being suitable for use as an engine oil is provided. The lubricating oil composition includes: a lubricating base oil, (A) 0.5 to 20% by mass of acylated bissuccinimide, (B) 0.05 to 0.3% by mass of zinc dithiophosphate in terms of the phosphorus content, and (C) 0.5 to 4.0% by mass of metallic detergent in terms of the sulfated ash content, based on the total mass of the composition.

Lubricating oil composition comprising acylated bissuccinimide, zinc dithiophosphate and metallic detergent

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Yokohama, Japan

Osamu Kurosawa