I think its gone away but i'm still worried. for some reason on my last tank of gas, shifts were VERY clunky. mostly when the car would downshift. I refilled yesterday and its shifting smooth as normal again. I only have 7900 miles on it. Is this normal? is there a fix? was it just a bad mix of gas or should i be worried?

On a better note, german cars are trash. :-D

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I would not worry about it myself as the warranty will take care of it. Drive it until it breaks. Mine has not done this yet.