Fred 
2009 BMW 5 Series Sedan 550i 4dr Sedan (4.8L 8cyl 6M)
Not the Ultimate Driving Machine
 This is a great car for performance and driving dynamics. This is not a good car for reliability, quality and running costs. I've had countless check engine lights, failed window regulators, excessive oil consumption, failed steering pump, failed ABS sensors, premature headlight failures, transmission shuddering, EGV failure, and few electronic issues in the interior components. Many of these issues were covered under warranty. However, the amount of time spent in and out of the dealer was ridiculous. Some repairs like the transmission shudder couldn't be remedied. This is the worst car I've owned in terms of reliability. It's the worst in maintaining its value. I sold it at a loss but I'm very glad that I did.