I learned this the hard way with my 1974 MG B. I test drove it and looked it over from all angles and there didn't seem to be any problematic rust. But lo and behold, digging into the floors a little bit they are pretty much rotten and now I'm doing a big restoration project. The lesson I learned the hard way, rust is 10x worse on the inside of the metal than it looks on the outside.
I’ve had 5 project cars and the worst was a Mazda. Rust ate the support channels from the inside so bad that it looked fine but couldn’t keep the wheels straight.
My most recent project is an old truck and it’s great. So. Much. Metal. Even if there’s rust you can easily cut it out and weld it up.
it looked fine but couldn’t keep the wheels straight
Damn, that's pretty advanced rust. What happened to the Mazda?
I think I got lucky, it seems that there's enough material left to patch up the frame and weld a new spring mount on. The car is pretty solid otherwise but discovering this was not exactly a good feeling after driving it at 180 km/h on the Autobahn just the week before.
Alignment shop was on their 3rd attempt before they figured out the issue. You could press a screw driver against it and it would feel fine, but a good strike would go right through.
Engine only had 50k and the interior and body panels looked great. All new brakes and other items. It became a donor for a different car that some guy was restoring.
Yeah that’s some odd rust, looks like sold metal around it. I’d be concerned about that area and keeping things in the right spot. Good luck!
Cheap cars can be hit or miss. My cheap car has a lot of miles, but no rust. It also has no power steering. The pump was leaking bad so I just took the belt off. I can live with it for now. One day, I'll get my ass in gear about it lol
Ironically the cheapest car I ever bought was also the most reliable I've ever had. It was a 2002 Mitsubishi Colt/Mirage (not the ugly one) for just 200 Euros. Still miss it.