Every used car is a pig in a poke. I bought a coupe at 45K and put 25K on it, then bought the roadster with 65K and have put 30K on it. The weak spots on our cars are well known. If they have been addressed, you will do normal maintenance plus repair whatever damage you do.

Some folks fantasize they'll only have to pay for gas and oil for the life of the car. They are always disappointed, but that does not dispel the belief and they try again with a different car. Definition of insanity...

A reasonable annual repair budget is $2500 in the absence of warranty. That's ~$200 a month. If that's too steep for you, you don't want a used car -- buy new, pay anyway and have more peace of mind.