Hi all, My wife daily drives a 2008 550i sport pkg carbon black 550i. Just hit 80k miles, under CPO until Feb. she loves it, as do I. Question is how long to keep it. It's been 100% perfect, bought CPO 2 years ago with 37k miles. Is this a car to safely keep for another 45-60k miles? What do you estimate our out of warranty expenses will be in the next 50k miles? I appreciate your feedback.