Engine and Fuel System Cleaner for Carbon Deposition Removal, G17 Fuel Cleaner for Cars Fuel, Fuel Injector Cleaner Additive for Car, Engine Cylinder Heads Deposition Removal : Amazon.co.uk: Automotive
Can I clean the valve cylinder head with it still in the car? If I spray brake cleaner will it contaminate the oil? Is it worth to clean it? : r/BmwTech