Sounds like great advice, and comes with a good story.
This is one of the only 1980s Mercedes models I never rode in. I knew someone with a 380SEC, but I couldn't get much impression of it's performance, as he was an older man who lived in central Seattle. I don't think he ever went over 40 or so.
I think they are maligned because of the mistake of the single row timing chain. They also had tall gearing (I think, correct me if I'm wrong) combined with the lowest output (Mercedes) V8 of the era.
None of that would keep me from buying a nice example.
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1979 240D, 4spd manual, Power Sunroof, manual windows, 147k miles, Pastel gray/Black MB Tex.
1991 300D 2.5 - Smokes like it's on Crack!