How often does Magotan B7 clean the engine carbon deposit?

Magotan B7 cleans the carbon deposit in the engine about 20,000 kilometers away. The specific time limit can be determined according to road conditions and vehicle mileage. Engine carbon deposit is a kind of combustion product produced by unsaturated olefin and gum in fuel at high temperature during engine operation. Magotan B7 is a long-wheelbase version of the seventh-generation Volkswagen B-class car B7 in China, also known as B7L, and a brand-new upgraded product of the sixth-generation Volkswagen B-class car Magotan. The body size of Magotan B7 is 4933mm long, 1836mm wide, 1469mm high and 287 1mm wheelbase, in which the wheelbase is 80mm longer than that of overseas models and 59mm longer than that of current models.