Tom 
2008 BMW 5 Series Sedan 535xi 4dr Sedan AWD (3.0L 6cyl Turbo 6M)
Fuel System Problems
 Great car, amazing when running well. My 535 is having a lot of problems with the car running very rough and has had several engine malfunctions.  The dealership has put in a new module, high pressure pump (HPP), and several new injectors.  Problem is routine to N54 engine.  BMW acknowledges the problem is a design fault.  Check out and have good warranty if purchasing.  Love the car when it works.