First, if the car does not move for a long time, the oil will flow back to the oil pan at this time, and the valve will lack the sealing and lubrication of the oil when the car starts, which is normal.

The second is the abnormal sound of the belt when it is started. In this case, it is necessary to check whether there is a problem with the belt in time.

If abnormal belt noise occurs, check the components first. This abnormal noise may be caused by the friction between the timing belt and the timing housing. You can loosen the screw on the official shell for half a turn to see if the abnormal noise disappears.

Secondly, you can check the usage of the generator belt, which may be the abnormal sound generated by the accessory belt. The tightness adjustment of timing transmission part is too tight. Remove the power generation and air conditioning booster belts to eliminate the problems of these two belts.

There is something wrong with the timing belt tensioner, which usually needs to be replaced together with the timing belt. It may be the noise caused by individual bearing problems of the engine. It is necessary to carefully identify the specific source of sound. If you can't find the specific reason, it is recommended to go to a professional repair shop to check and determine the reason.