Note your mileage before and after. They're going to have to drive it to diagnose, and if you tell them it's a high rpm problem they have to wind it out to see what you're talking about. But if you come back and it's got 50 miles more on it, there might be an issue. If you go to a reputable dealer, you should be ok. Keep in mind most people don't go on the internet when things go well, so the ratio of horror stories to success stories is wildly inaccurate.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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