The bearing lubricating oil can be classified into two kinds including plain oil and high temperature grease.
The plain oil has small density, high lubrication, good effect of sound filtration, and changes obviously affected by temperature. It is like condensed lard oil in appearance.

The density of high temperature grease is very large, and the lubrication effect and sound filtration effect are relatively low, which makes it not to be dried by roasting like plain oil when working under high temperature environment. Its appearance is like very sticky barley-sugar.

The plain oil can get high revolving speed and low noise. There are various colors such as golden yellow, black and green.