I just replaced my bad starter with a used one that works fine. The point here being that I didn't turn the old one in for the core charge, so I still have it. I am assuming some places will pay you the core charge amount even if you are not buying - true? Although, now that you are talking about it, I wonder if I shouldn't rebuild it and hold on to it for future use.

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
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"Back off, man. I’m a scientist” ~ Peter Venkman