$3,500 X5d Eco Credit - What's the catch?

[F150 Duke]

Ladies and Gents,

So my BMW consideration was previously just used until the $3,500 ECO credit for a new ’11 was pointed out to me. This brings the price of new vs. 1 year used, extremely close (within $5k) after negotiations near invoice. I read the fine/gray print on the site regarding the ECO credit but it didn’t answer very many questions.

Does anyone know if the ECO credit has any “catches”? For example, do I need to use BMW financing? My local credit union is 2.99% for 60 mths which is a lot better than the 4.9% at BMW.

Thanks!

Jason