Keep 2006 330xi w/102k miles vs get a 2010 528xi CPO

F10 vs. E90. Personally, these are two every different yet similar vehicles in my book. The F10 is much roomier. If you have more than a party of four full-sized passengers, then you have your answer. As for maintenance, both share the same drivetrain and underpinnings. I assume that you have driven both vehicles and noticed that the F10 rides very different. It really comes down to personal preference here and how long you like holding onto and maintaining your vehicles.