It is said that shell gasoline can remove carbon deposits and run further. I tried recently, but

Don't be fooled, high-quality gasoline can only reduce the production of carbon deposits, but can't remove the carbon deposits produced before. Impurities such as wax and colloid in gasoline are the main components of carbon deposition, so the carbon deposition trend of high cleanliness gasoline is weak.

Carbon deposition includes two concepts:

Engine carbon deposit: a kind of combustion substance produced by unsaturated olefins and gums in fuel at high temperature during engine operation.

Carbon deposition in EDM: Carbon deposition should be avoided as much as possible in EDM, especially in precision die machining.

Carbon deposition is a manifestation of abnormal discharge machining of spark machine.

It can be clearly seen from the sketch of a general engine that the power source → mixed gas must enter the combustion chamber through the intake valve.

A small amount of gasoline will adhere to the intake valve. When the engine is at a high temperature, hydrocarbons, paraffin and colloid that cannot be completely burned in gasoline will burn into colloidal carbon. If there is scale in the nozzle, the sprayed gasoline will be in a state of poor atomization, and the uneven mixing of gasoline and air will increase the condensation of gasoline in the intake valve.

As long as it is an internal combustion engine, it will produce carbon deposit.

Baidu encyclopedia-carbon deposition