You lock in a rate when you order the car. So you can pick which ever financing rate is best for you when you actually purchase the car. So as previously stated, you get either 3.9% or 4.9% with a $2,500 credit. Depending on your lease terms or amount down on a loan, the 4.9% + $2,500 might be a better offer.
'10 335i sedan/AW/Premium/M-Sport/Steptronic/Active Steering/6FL/Logic7/Sirius/heated seats/rear fold seat/alarm/Navi/Performance Power Kit