The reason why a car smokes when adding oil is:
1. The smoke is black smoke, caused by poor combustion in the engine when the mixture is too rich.
2. It is the white smoke, lack of water in the water tank and high temperature that cause the cylindrical mattress to be poorly sealed, causing leakage of water inside the engine, or the gasoline added, contains a large amount of water. Methods to deal with smoke in the car: 1. Check the engine block and cylinder gasket for damage, and check whether there is water in the fuel tank. 2. Consult the car manual and add gasoline with the correct label in strict accordance with the manufacturer's regulations.
3. Always check the degree of aging of the carburetor and other parts. Carburetor cars are different from EFI cars and requirerequire frequent maintenance and adjustments. Check the cylinder line every 30,000 miles and check the spark plug every 10,000 miles. If a problem is found, replace it in time.