jbmw3 
2009 BMW 3 Series Coupe 328i 2dr Coupe (3.0L 6cyl 6M)
The Ultimate driving machine
 This is my 4th 3-series, and I should have done more research. When AC is on, the engine does not feel as smooth as it should when stopped at a red light. Driving at speeds of 40 miles per hour, you can hear high pitch sound. The run flat tires are a good idea, but makes the ride feel more stiff, tires wear out quicker than regular tires, and the tires cost about 150 dollars more per tire. Gasoline requirement is recommended 93 top tier gasoline. One interesting thing I noticed is that if their are no error codes during the diagnostic  testing, you can forget about BMW looking into it. The part has to break down. 