机油在发动机中的作用有:润滑、密封、冷却、减震、防锈等作用。机油粘度不同,应该说对以上作用都有一定的影响。粘度高不一定摩擦力就大,还要看摩擦副的配合精度和表面加工精度。机油的粘度无论是高了还是低了都会对发动机产生很大影响。粘度标准是采用SAE粘度分类,用于区别润滑油所适用的不同的温度范围。选机油时一定要根据厂家的要求选机油,如果不按照厂家要求选择机油粘度就有可能会影响发动机的运转。
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