Efrem, very interesting. The same thing happened to me about 4 years ago (BMW dealer, had the Amex card in the window...). I called Amex, and they said that it is the dealer's discretion as to what they will accept the card for, despite the apparent commitment they make by posting the card-accepted sign on their premises. Finally, they (BMW dealer) said that since they accept the card for repairs up to (I forget the exact amount) about $4,000 for repairs, they would let me charge that amount, which I, like FFFundi, did.