The difficulties own old BMW is how to change the spareparts. Old BMW often time not available on the spareparts shop anymore or the price of new spare part is expensive because will compare to the price of new BMW.
Old parts may still use in modern car but the price always very high if compare to the price of old car itself. To overcome the price problem you can hunt of old sparepart that usually can find in the broken BMW car. In this second hand car, you may can find out the spare part you want and still enable to use again to complete your car. To find this kind goods may rather difficult but the price still lower than the new one. For information, you must know the price of new spare part and then find the old ones, so do not be fooled with the offer price. The price should be maximum a half of the new price.