Semi-Official I'm Thread LVIII
I'm preparing to de-carbon the intake valves on my 2019 WRX , using CRC chemical treatment. This will be the first time in 3 years, 45k kms on the motor. It has been idling a bit low lately and MPG's don't seem as good. DI engine's have issues with carbon, I should have done this sooner but now is a good time as any.











