I currently don't have any M-B's, but I've owned three and have worked on a few others in the past...probably put about 100K miles on them altogether.
Had an '85 300D from 2002 until I made the mistake of giving it to my ex-girlfriend in '06:
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Had a '79 300SD from '06 until '09, that was a serious basket case...pretty much nothing on the car worked and it ate tires like they were BonBons, so when the transmission lost Reverse, she got parted out:
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(interior being stripped out in this pic)
Finally, I had an '83 300D from '09 until 2011. For some reason, she did worse on fuel than the other two (averaged 22 to 23 mpg, compared to 27-30 for the '85 and 25 for the '79); sold her to a friend after buying my Jetta:
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