Cars are generally a waisting asset and if you buy a new car you will also be faced with deprecation. If you stick out for a while you will pay off the loan and be able to make new payments on the next car. Buying a new car now will probably increase your cost of ownership and make matters worst. Unless you want to go down market say a Toyota Corolla for $14,000 you probably you should enjoy your current ride and stay the course. Sorry about your lose regarding Source 1 but selling now could only make matters worse.

People call boats a hole in the water in which you throw money, well owning a car especially a luxury car like a BMW is no different. I enjoy my BMW and realize that the cost of ownership is higher; I bet you enjoy your BMW as well.