Anything that makes me crawl under the car, especially if it involves removing bolts which are Allen bolts. We had a DIY session last weekend and having a lift to work under makes life SO much easier. I'm planning to put a lift in my next garage.

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1987 300SDL 265,000 mi.
1982 300SD 325,000 mi. (and holding)
1956 Packard Clipper 150,000 mi.