Is the charging standard for carbon cleaning of automobile maintenance projects high?

Topic: 300 yuan, including the cleaning of injector, throttle and engine. For example, the use of engine oil with more carbon deposits and poor power in maintenance can be improved. At that time, a lot of semi-synthetic engine oil carbon sludge was used for maintenance, and the car was in poor condition. Finally, in order to improve the car condition, I upgraded the engine oil to high-quality PAO imported gt Maroon 5 engine oil, which does not produce carbon deposit and can effectively remove sludge. Now it is very good in power and engine mute performance. Baidu, may wish to know the details.