Glad you didn't do it... Although I would have felt bad for you, I would have still had to make fun of you!
(J/K)
That dealer is a schmuck. It's hard to believe he'd take take a car that has HARDLY and depreciation and offer you a 6 year loan for THAT much... Basically, he'll make 10,000 over invoice on that deal because he'll sell that Maxima for for almost exactly the same price that you purchased it for (even though he'll be buying it back for 4-5K less than he sold it to you for - like a really expensive rental), and he's clearly marking up the Z quite a bit.