There's these guys; Tucson Mercedes Club | Chaparral Section - Tucson Arizona
but usually guys just get together and decide on a "let's fix-em-up" day. Kinda of a Benzhead's version of a "spa day".

Desert Panther is planning on coming by my place this week-end to do some fiddly stuff on his 300SD. You're more than welcome to pop by. Pima/Craycroft area.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now