The power of Mercedes-Benz A was normal at first, but it decreased after a while.

There are several reasons for the decrease of engine power: 1. The quality of gasoline is poor and the oil circuit is blocked. 2. The tire pressure is not good. 3. Excessive carbon deposition and burner loss. 4. The throttle is too dirty or the belt slips or breaks.

Precautions for the use of automobile engines are as follows:

1, avoid neutral driving: the engine itself has the function of slowing down and cutting off oil, but neutral is not conducive to fuel saving.

2. Pay attention to observation when using the vehicle. If there is engine oil on the ground, it is necessary to judge whether there is engine oil leakage, and communicate with the automobile 4s shop in time to eliminate potential safety hazards.

3. Don't turn off the engine immediately after high-speed driving or climbing, and turn off the engine after idling 10 minutes. The speed of carbon deposition in cars equipped with turbochargers is several times faster than that in ordinary naturally aspirated cars.

4. When moisture is mixed or inhaled in the brake oil, or impurities or precipitates are found in the brake oil, it should be replaced in time or carefully filtered, otherwise the brake pressure will be insufficient, thus affecting the braking effect.