Lubricant oil composition for internal combustion engines

Details Lubricant oil composition for internal combustion engines Lubricant oil composition for internal combustion engines

C - Chemistry, Metallurgy

10

M

C10M 101/02 (2006.01) C10M 171/00 (2006.01)

Patent

CA 2289172

This invention provides a lubricant oil composition for internal combustion engines which shows a suffiently low volatility at high temperature and good low-temperature viscosity characteristics. The lubricant oil composition for internal combustion engines comprises a base oil which simultaneously satisfies the following relationships (a1) and (b1): (a1): [(A~GCD5-50 + B)Exp((C~GCD5-50 + D)KV100)]/KV40>1, and (b1): E~Exp(F~KV100)/KV40>1, wherein, GCD5-50 is a difference between 5% and 50% distillation points (°C) by gas chromatographic distillation test, KV40 and KV100 are kinematic viscosiries (mm2/s) at 40°C and 100°C, and A to F are constants, A: -3.17 x 10-3, B: 2.87, C: -3.78 x 10-4, D: 4.91 x 10-1, E: 9.41, and F: 2.09 x 10-1.

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