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Ive had both m103 and m104 w124s and a m104 w202. The 103 car never gave me any issues but it was also a much nicer car owned by my mother. The second one had all the textbook issues and I sold it after my buddy ran it without oil.
The neutral safety switch, ovp, and anti theft issues can leave you stranded. Id suggest bypassing the antitheft and keeping a spare ovp and nss in the car. The wiring harness decay is very slow and its like your car has Alzheimers. I've only seen a m104 head gasket fail dramatically from a bad water pump. Losing reverse generally sucks too. I had the intake resonance flap fail at one point and it was dog until I replaced it.
Im not trying to be overly negative though. These are just the issues Ive experienced. The m104 is a really good engine. Its unfortunate they're all over 20 years old.
Last edited by Mighty190; 08-07-2017 at 10:01 PM.
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