Early '90s up through at least 1996, or so I have heard. My '96 E300D (early W210) definitely has the problem although not as bad as some folks have had with theirs. AFAIK, the only problem with the early W124 cars (for example 1987 300D Turbo) is the wiring to the rear windows – and that is a stranded wire gauge problem, not an insulation problem. Don't know about c-class or s-class cars of that era.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970