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4 多级内燃机油和双通用内燃机油的选用4.1 多级内燃机油的选用多级内燃机油(下称多级油)的性能比单级内燃机油(下称单级油)好,主要是多级油的黏温性能好和工作温度范围宽。例如:SE 15 W/40内燃机油,它既具有15 W黏度等级内燃机油的低温黏度,又具有40黏度等级内燃机油的高温黏度。当多级油与单级油在100℃
4 multi-stage internal combustion engine oil and dual-purpose internal combustion engine oil selection 4.1 multi-stage internal combustion engine oil multi-stage internal combustion engine oil (hereinafter referred to as multi-stage oil) performance than single-stage internal combustion engine oil (hereinafter referred to as single-stage oil) Oil viscosity and temperature performance and wide operating temperature range. For example: SE 15 W / 40 engine oil, which has a viscosity of 15 W viscosity of low-temperature internal combustion engine oil viscosity, but also has 40 viscosity grade high viscosity of engine oil. When multi-stage oil and single-stage oil at 100 ℃