How to effectively remove the sludge in the oil bin and the carbon deposit in the engine?

The engine has three routes, namely, oil route, gasoline route and air route. It is very important to keep these three routes clean and unblocked:

Engine oil road: synthetic engine oil has little sludge, and synthetic engine oil itself has a strong cleaning function, but it must be cleaned before changing the engine oil brand;

Gasoline road: change the gasoline grid regularly, add some gasoline additives and drive for 20-40 thousand kilometers, then drive at high speed;

Air path: The air filter element is very important. You can't use fakes. Change frequently, and then drive 40 thousand kilometers to clean the throttle.