Quote:
Originally Posted by PrematureApex
That's the whole point, because fuel/air mixture is not being washed over the backs of the valves, carbon builds up. You can run whatever gas you want, it has no effect on the issue.
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I don't believe BMW has the same problem that is so prevalent to VW DI engines. They have super crappy valve seals. Just google
GTI Carbon build up and you'll be amazed what you see.