These are the W124 station wagons, the intermediate series between the S Class and the smaller 190's. These are great cars, but have complex climate control systems that are now long in the tooth. Suspension rebuilds are $$$ too. The drive train is bulletproof. Have the car checked by a mechanic who knows 124's.
I have an older 123 diesel wagon from '85, w/300,000 miles and running great. I intend to run it until the wheels fall off, years from now (if it doesn't rust first).
BTW, This is not the G series SUV, which was not imported officially to the US during this time.
Don McClure
Bel Air, MD