| abstract |
The present invention provides a lubricating oilncomposition which has a low viscosity and is capable of maintainingnan anti-wear characteristic at the initial use thereof and afternthe long-term use thereof, in particular, a lubricating oilncomposition suitable for automatic transmissions or continuouslynvariable transmissions by incorporating, into (A) a lubricantnbase oil comprising a mineral oil, a synthetic oil or a mixturenthereof, (B) a nitrogen-containing compound having at least onenalkyl group or alkenyl group having a number-average molecularnweight of 900 or more and/or a derivative thereof in an amountnof 0.01 to 0.20% by mass in terms of the content of nitrogennof the total of the composition, and (C) a viscosity index improvernhaving a weight-average molecular weight of 40,000 or less, sonas to set the viscosity index of the composition to 160 or morenand set the kinematic viscosity of the composition into the rangenof 20 to 30 mm 2 /s at 40°C. |