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      07-09-2019, 04:11 PM   #2
Billfitz
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Drives: '15 328iX GT
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The main gains would come from cleaning the intake valves, which get nasty with carbon deposits. Installing an oil catch can removes the main source of the carbon build up, oil from the crankcase via the PCV. A bottle of injector cleaner every few thousand miles keeps injectors clean.

Last edited by Billfitz; 07-09-2019 at 05:18 PM..
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