油箱底有油泥。

There was some sludge at the bottom of the tank.

这表需要擦油泥。

The watch needs cleaning and oiling.

残余油类物质种类系指残油、含油污水和油泥。

Oily substances are confined to oil residue, oily water and sludge.

这种类型的滚珠轴承因为这些油泥造成使用失效是很典型的。

The typical instrument ball bearing failure is characterized by the presence of such sludge.

内燃机油在中低温运行工况下容易产生油泥问题，一直是油品研制者关注并设法解决的对象。

The sludge forms easily while the engine oil runs at medium and low temperature, which has been a problem that the oil developers pay attention to and want to solve all along.