As a freelance automechanic i see all kind's of jobs, currently i'm overhauling a 21 years old OM441 with 500.000 miles on it in a bus.
The engine is located behind the front axle.
Rust and conditions have taken their toll
Everything is painted to slow corrosion.
Not the best space to work in:
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600SEL '91

300E 4Matic '88
240D '83

280SE '77

350SE '73

The most complex systems can fail in the simplest way.
Contra verbosus noli contendere verbis, sermo datur cunctis, animi sapientia paucis.
i don't believe in the lord! He's never bought me a Mercedes Benz.