How often does Ford Forex maintain and clean up the engine carbon deposits?

A normal engine needs to be cleaned every 40,000 to 60,000 kilometers, but it also depends on the actual situation of the engine. Carbon deposition is mainly produced in the combustion chamber, and the quality of gasoline used is not good, or the filterability of intake filter is not enough. If there is oil burning, the quality of the oil used will also be affected. If there is a lot of carbon deposit, you can clean the engine once. The gasoline and filter I use now are very good, and the oil is also high-quality GT Maroon 5 oil. The base oils of the four PAOs are of good quality, and even with engine oil, carbon deposition will not occur. At the same time, liquid molybdenum is added, which has good wear resistance and protection, and there is no problem when the car runs.