If you average your monthly maintenance on your MB, how much is too much? In 2002 I spent an average of $387/mo. maintaining my '83 SD. Of course, this is in lieu of a car payment, but I could get a pretty nice (newer) MB for that.

At what point do you get a different old car? I remember one previous post ("the naked truth", I think), where someone said if over $400, DUMP IT!!

What is your monthly average?