在四冲程发动机中,润滑油中的不溶物沉积在曲轴箱边盖、挺杆盖、油底壳及滤清器等温度较低部位上的棕黑色稀泥状物叫油泥。在温度较高时,它则成烟炱状物,温度较低时则为较稀的油泥。它可附着在发动机上,也可沉积在变速箱或油池底部。四冲程 In a four-stroke engine, the insolubles in the lubricating oil are deposited on the brown, dark, thin sludge on the crankcase cover, tappet cover, oil pan and filters, and at lower temperatures. At high temperatures, it becomes a sliver of smoke, while at lower temperatures it is a thinner sludge. It can be attached to the engine, can also be deposited in the gearbox or tank bottom. Four-stroke