You might want to throw in a couple pairs of nitril or latex gloves and a few shop towels, in the unfortunate event that you have to get your hands dirty.

Also, I always carry some zip ties - you never know what might shake loose!

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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