This might start a little controversy, but remember we are all Bimmer drivers, and we all love bimmers no matter what series...BUT Within the past 15 years which series do you think is the most reliable? The 3 series or the 5series? I had a 2003 530i and that car, although beautiful, was always in the shop! I mean it had 123,000 miles on it but man... I had to replace my rear shift differential@ 80,000 miles, replace torque converter in my transmission@ 85,000miles, among other costly crap. I now own a 2007 335i, and right now it's the dealer about to get the high pressure fuel pump replaced, at 54,000 miles, although the high pressure fuel system is on a 10year 120,000 mile warranty. So I have nooo idea which model is more reliable. Excepting any and all answers/examples! Thanks guys!!! Sincerely..The problem starter.