Well, a new 235 is about $20K, and I'd thought a major overhaul was
about half that, but apparantly I was wrong given the number of people
in this thread who're telling me I am.

Jeff wrote:

sounds like that engine is about due a overhaul.
I dont know what an engine costs for a 152, but you may want to check on
that so you know about how much your going to have to invest in the new
engine.