Quote:
Originally Posted by Duc Hunter
NOX Warranty sounds great. What would be even more ideal is for BMW to at 77k miles (warranty ended at 60k) to do a CBU cleaning free when then fix the NOX! Wishful thinking I know.
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I cleaned my CBU at 75k miles and did not notice any driving or MPG improvements. IMHO CBU is more of a 335d issue. For my X5, the intake was a mess but the valves were not that bad.