2. Due to different departments, the classification of oil needed is different. Friction and lubrication is a very profound knowledge. Some parts can be served with ordinary engine oil, but some places must be butter.

3. Butter can reduce friction, prevent rusting, prolong service life and give full play to its function. Equal effect. The butter on the car is mainly the chassis, and there are special tools and equipment such as grease guns to buy.

4. Butter plays the role of lubrication, reducing the friction coefficient between metals. Except for normal secondary maintenance, there are butter nipples in places where butter is needed every day (such as steering knuckles and transmission shafts).

5. Cars generally don't need users to deal with this problem, mainly trucks. There will be butter nozzles in front wheel steering parts, steel plate pins and other places, so the grease gun is aimed at it.