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This is why I lease. All DI engines have this issue. The only way to solve it, is to use a secondary fuel injector in the intake to run a maintenance cycle. But like fuel injection 30 some years ago, it will have it's issue and get resolved.
Side not, to help with carbon build up. You need to ream your car once in a while to get the heat up and push the engine at high revs. BMW need to be driven hard, everyone with issue is usually pussy footed around town.
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