Ron, check for a complete set of service records for that 1992 400SE. As I recall that vintage S-Class automobile had numerous problems in the early years (say 1992 thru 1995) and almost caused MB to go bankrupt. It certainly hurt their reputation for reliability and high quality. A friend on mine bought a new 1992 500SEL and had regular problems with it. So many that he unloaded the car within 2 years of purchase.

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Fred Hoelzle