Too late for that particular example but when inspecting the M102 8 valve with the engine COLD, stick your hand underneath the 4th exhaust runner where the cyl head and block meet. If you find oil here it needs a head gasket. I talked down a $2000 asking price to $1000 when I found the leak. 93 2.3 auto 105k miles 3 bought years ago. First head gasket job I've ever done and it was well worth the effort.
Good luck with the car search. I wish I had a 190e when I was 16.

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CENSORED due to not family friendly words