I could take the battery out of my 190d and put in it, see if it would turn over and whatnot. They don't have the keys, so I guess I'd have to pull the column apart and remove the lock assembly or something, I'm not really sure how you'd go about that honestly. I know how to do it on the D21 but I've never had a need of hotwiring a Benz lol.

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2010 Mercedes E350 4Matic - 77k miles
1986.5 Nissan D21 V6 4x4 - 276k miles
1987 Mercedes 190D 2.5 Turbo - 3??k miles
1983 Mercedes 300SD turbo parts car
2017 Honda CBR500R - 15k miles
2016 Suzuki GSX S1000 - 9k miles