DH 
2008 BMW 3 Series Sedan 328xi 4dr Sedan AWD (3.0L 6cyl 6M)
Most Unreliable Car I Ever Owned
 After driving Saabs for the past 23 years, I excitedly bought a BMW.  What a mistake! This is the worse car I have ever owned and that includes a 1973 Vega. It has stranded me, requiring a flatbed ride to the mechanic 5 times in the past 2.5 years.  It drives nice, the AWD is excellent and is a  great car when it is not with the mechanic. Here are the problems to date:1. Broken Motor Mount Bolts at 41K miles                                                                                                                                                                                                                      2. Water Pump Failure at 50K - stranded                                                                                                                                                                                                                          3. Serpentine Belt Failure at 57K - stranded                                                                                                                                                                                                                    4. Fuel Pump Failure at 61K - stranded                                                                                                                                                                                                                             5. Ignition Coil Failure at 72K - stranded                                                                                                                                                                                                                           6. Starter Failure at 76K - stranded                                                                                                                                                                                                                                    Based on conversations with 3 colleagues that also own 328s and 335s, these problems are common. I am dumping this car in the spring and will never own a BMW again.