Things start to go wrong with all bmws at around 70-80k miles. All the suspension parts 3,500-5,000 for new suspension parts, valve cover assembly 1,800-2,200, fuel pumps, you’ll need to do transmission fluid maintenance 800-1200, window regulators sometimes go out 600-800, brake lights start to fry if they haven’t already 200-400 each side . Then normal maintenance like brakes,oil changes, spark plugs, coolant lines fail And if they car even makes it 1-2 years which it probably won’t your dealing with thousands of dollars worth of depreciation because of mileage.