How much carbon is deposited in engine cleaning?

About the landlord's concern about "how much carbon is accumulated in engine cleaning?" The following is my personal opinion:

The carbon deposit in engine cleaning is around 400 in 4s shop, and the outside repair shop estimates that it is around 200 yuan. The cleaning technology is as follows:

1. If the vehicle is used in urban areas for a long time, it is recommended to clean the fuel injector and air intake every 20,000 km and the electronic throttle body every 10000 km.

2. If the vehicle is in very good road conditions and driving at high speed for a long time, the cleaning cycle can be extended;

If the environment is not good, I suggest you go to the repair shop at 65,438+00,000 kilometers. Million car purchase subsidy