I used a system cleaner a couple of weeks ago on my cooper s the one I used went in with a full tank of fuel(went in the full tanks also) its about £15. Cleans the valves a bit from the carbon build up. Won't fix it long term. It seemed like the power was a bit better but I still think I'm gonna take mine to mini to have it properly cleaned. Should be covered under warranty. Hope this helps. Emma.
Hi, I'm new. For my BMW 335i, many are doing walnut shell blasting to clean the intake valves of carbon build up. The before and after pics were amazing. In fact, I will be having this done in a month or so as well.
Do Mini owners also use walnut shell blasting as a solution for the carbon build up?
I suppose it would work but I think those that ask here want a solution that doesnt need engine dismantlement to do it. Its easy enough to clean the bits once they are on the bench.
Unless of course youre actually running your car on ground walnuts??
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