@piggo At least they weren't hiding it! Usually it's up to you to do a close inspection and find stuff like that :)
We've poked around some pretty mistreated cars when buying ours. Sometimes good to drop the price if you're ok fixing it, but often just run away, like when you find thick black gloop in the engine and when asking when the last oil change was, they look at you blankly - what's an oil change?