That would be the difference between a domestic and a german vehicle...right now I have a 325is 1995 with almost 130,000mi on it and it still runs like it was brand new...the car has a full service history (which is the most important thing to ANY car...because if you dont take care of your car it won't last long at all!) The E39 (the 5 series MY you are looking at buying) were great cars...I'd be happy to lend you any knowledge I have to help with your decision...Contact me here any time.
Good Luck
