Why do 4S shops add engine oil to the maximum level?

[SanBennett]

4S shops add engine oil to the maximum level because when car owners go to 4S shops for maintenance, the car is in a hot state. There are two points to note when adding engine oil: 1. When selecting engine oil: it is necessary to strictly follow the engine oil grade specified in the car manual. If there is no oil of the same grade, you can use a higher grade of oil, but you cannot use a lower grade instead. 2. When adding engine oil: the amount of engine oil added should be slightly lower than the standard scale. Too much engine oil will increase the rotation resistance of the crankshaft, reduce the output power of the engine, and excessive engine oil will enter the combustion chamber and participate in combustion, causing the vehicle to burn oil, emit blue smoke, and even increase fuel consumption.