Since your car is under warranty, Skippy gave you the correct advice. Write down what has gone on with the car over the past day and give it to the service advisor at the dealer. As you noted, you don't want to do anything to negate the warranty.

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'89 260e (212K Mi.), '92 400e (208K Mi.), '92 400e (not a misprint) (146K Mi.), '95 C220, '81 240D--Sold