For a MOT pass can the bad areas be cut and removed then be plated and welded etc putting the strength back into the frame.
Hmm, from a person who has done lots of welding in my time I'd say this is a recipe for disaster. It's really difficult(impossible) to do this safely and permanently. Anyway if it's got that bad already most of the subframe will be on it's way out. Also remember an M3 has more horses to deal with.
It's a case of a new subframe if possible or a good used one. Rustproof either thoroughly - myself I'm a fan of Owatrol oil externally and Dinitrol internally.
Front or rear subframes can be the end of many a car. Whilst car bodies are usually galvanised these days (although this varies between makes) most subframes / suspension components(oh and sumps!) aren't.
Rust is still a car killer.
Edited by Big John on 06/01/2023 at 23:37
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