Well,

To try to help..

Your first mistake was leasing. When you did your lease you paid either a $500 or $750 acquisition fee. So, with a quick turnover, you just lost that $$$.
- Secondly, you didn't flip it right away. Now it is a used car. I am not sure the exact price of a new 3.0, but your car has took a $5K derpecation the minute you drove it off the lot. And, it is at the end of the model year of 20005.

- To boot, the minute you turn your lease into a loan, you have to pay tax on the full price of the vehicle, not just the part you are leasing.. So be prepared to pay a whopping check at the DMV when you switch registration to ownership under a co-owner agreement (BMW is your co-owner.)

So, between the lease payment, the new tax payment, the depreciation.. Don't expect to make any money at all. You would be lucky to break even and you still have to find a buyer.

My suggestion, YOU GOT AN AMAZING DEAL... Keep the car, enjoy it, the 3.0 is not slow.. And smile everytime you got into it knowing you saved $10K..

But just to be clear, as soon as you run the real numbers of the costs, finance payments, taxes, resale... You will turn a great car deal for you into a "break even" If you don't care about the $$$ and just want a 4.4, 4.8..
I would consider even going back to the same dealer, tell him you want a bigger engine. I am sure they will be happy to take back the 3.0, put you into a bigger engine and still give you a good deal. It will give them a chance to recoup some of their losses. So maybe you guys can split the difference. They will give you an amazing deal on a new one, have a pristine 3.0 that they can sell at a profit, and you get the car you want..

B

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"When two people agree on everything, one of them is not necessary" - Arliss