All my vehicles have timing chains, so no regular maintenance there.
I did bring my truck to a Cummins shop to do a general evaluation of the powertrain once, but I was young and didn't know anything about diesels back then.
One thing I'd never try myself is fiberglass repair. I tried a few times to work with the evil stuff and suck at it, so I'll happily pay to never mess with it again. If I cared about appearance, I'd probably hire that work out too. Anything that is more of an art than a science is better handled by the artist.
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