I already had a $650 payment on the '01, so all else being equal, the payment wouldn't change, only extended. With the new 0% 48 month incentive, and adding the service contract, my payment will be going up close to $100 a month over a loan based on 60 payments, but will save almost $4000 in interest and only extend my loan 1 year over the loan for the '01 I sold. In any case, the money is one of the only downsides I see to the trade, but all the deals came together on this one for me to make it worth it.