The engine of Guanzhi is very loud. What kind of oil can be changed better?

Let's check what caused the noise first. If it is an oil problem, you can replace the original oil. Choose the car that suits you according to the region. Generally, 5-30 is enough. If the maintenance manual supports full synthesis, replace the synthetic engine oil. Don't blindly replace. If it's not the engine oil problem, you can clean the throttle according to the friend above to see if the carbon deposit has increased.