The carbon deposit in the intake valve of BMW x 1 car 2889 cannot be cleared.

It is very easy to clean up the carbon deposit in this intake and exhaust valve. The key is to choose the right fuel additive.

There are three common methods for cleaning valve carbon deposit:

Add "fuel treasure". Adding that cleaning agent to gasoline is the simplest operation, but the effect is not so good. If you add a bottle before checking the car, it will have some effect. In daily use, fuel treasure has little cleaning effect.

Drink. Bottles are similar to hospital bottles. The cleaning liquid is dripped into the valve, and the cleaning effect is better. It is often used for engine cleaning without disassembly, and it is also an effective cleaning method.

Remove engine and cylinder head. Disassembly and cleaning is definitely the most thorough and direct cleaning method, and the cleaning effect is also the best. But the process is complicated, and once the engine is disassembled, it is often not as sealed as the original factory, so it is better not to disassemble and clean it.