2.0 Does GAC Chuanqi GS5 need to do engine cleaning for every maintenance?

The engine of the old car is dirty, but it is not necessary to clean it every time. It's too much trouble and waste. You can check it before maintenance. If the engine is clean, it is not needed. If it is dirty, do it. After that, you can change the oil with better cleaning effect, such as G? T demon? Force? Red, very clean. In synthetic engine oil, the quality of four PAO base oils is better than that of three base oils.