Say what! ? seller posted an '86 300D on Craigslist. $2000
Stated the now trite "Mercedes diesels are known to go 500K miles blah blah:

Looks like a 124 chassis to me.
It might be a greymarket or non turbo or a 87 misrepresented:
http://losangeles.craigslist.org/car/56631185.html

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!