I have a chance to pick up a 2004 645Ci SMG. There is a link below. I saw that certain build dates have different features and problems and I'm interested in hearing about them. I like that the car was a one owner and there is no accident history but I'm concerned there doesn't seem to be any maintenance history - at least not listed on the carfax. Also, I'm somewhat familiar with SMG but would like to know specifically how it applies to this car.

I would appreciate any suggestions or advice other owners have.