get a good lawyer... your complaint to the BBB prolly wont amount to anything. Take the care back to the dealer. they cannot ignore you if you are there. if they do and pass the buck. some of the ML's have a nickname...they are built in Alabama (last time I heard the name anyways) the dealer lied to you if they said it was only a gas cap if you diddnt have the code read. I assume you did not have a PPI done on this vehicle?

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed