Patent ID: 6140283
Filing Date: 2000-10-31
Classification: C10M

Abstract:
A lubricant oil composition for internal combustion engines, comprising a base oil which simultaneously satisfies the following relationships (a.sub.1) and (b.sub.1):[(A.cndot.GCD5-50+B)Exp((C.cndot.GCD5-50+D)KV100)]KV40>1, and(a.sub.1)E.cndot.Exp (F.cndot.KV100)/KV40>1, (b.sub.1)wherein, GCD5-50 is a difference between 5% and 50% distillation points (.degree. C.) by gas chromatographic distillation test, KV40 and KV100 are kinematic viscosities (mm.sup.2 /s) at 40.degree. C. and 100.degree. C., and A to F are constants, A: -3.17.times.10.sup.-3, B: 2.87, C: -3.78.times.10.sup.-1, D: 4.91.times.10.sup.-1, E: 9.41, and F: 2.09.times.10.sup.-1.