| 摘要 |
The invention relates to a lubricant composition for spark and compression ignition four stroke cycle engines for motor vehicles. According to the invention, the composition comprises 92 ...95.5 % naphthenic mineral oil, prepared by solvent treating and hydro-conditioning, having a viscosity of 7.7 ...9.2 cSt at a temperature of 100 degree C and a viscosity index of at least 59; 0.4 ...0.8 % olefin copolymer or 2.5...3 % polymethacrylate with viscosity index improving and pour point depressant properties, and 3.8...5.2 multifunctional additive with oxidation-preventing, corrosion-inhibiting, wear resistant detergent-dispersing and antifoaming properties, containing 4.50...5.10 % calcium, 1.91....2.51% zinc, 1.80...2.38 % phosphorus, the product having a viscosity of 10.5...15 0 cSt at a temperature of 100 degree C, a viscosity index of 89...92, a content of 0.190...0.270% calcium, 0.88...0.120% zinc and 0.082 ....0.110 % phosphorus, the percentage being expressed by weight.
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