Your going to really battle with that one I am sure.
In the older cars, banks want equity, ie value in the car.
In other words, for 100k car that is 10 years old, the banks will require (not sure what the split is) but like 50% equity, meaning you would have to put down a deposit of 50k, and then they will do it. They weight the other 50% risk on being able to repo the car and get reclaim their investment, thereby reducing your risk.
According to the books, that BMW probably would not feature, adding to it that there is no market, and it is a moveable asset, I doubt it...
You are better off going for a private loan (expensive) or taking the money out your bond (cheapest interest available), but I doubt you will get finance for that