I agree this smoke issue is probably normal. As Jim said it's just an accumulation based on you not really driving that hard (most of the time). I drive ten of these cars a week and its is almost certain the first shift taken to the redline makes the car behind me disappear and slam on his brakes (bg).

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician