I don't think it's related to the model year. Like your '84, my '82 will spin from a start and chirp on the 1-2 shift every time if you don't go easy. My guess is that we are lucky to have found a couple that have been well maintained and run like sewing machines; It truly is stealth power.

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1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick