There's an old joke about an auto mechanic and a surgeon having a conversation. The auto mechanic complains that the surgeon makes too much money, and explains that their jobs are similar. He details the intricacy of rebuilding a high-performance engine and suggests that maybe the surgeon (whose job is so similar) is over-paid.
The surgeon says: I rebuild engines while they're still running. Do you do that?
I know it’s a joke and all, but mechanics don’t even rebuild engines anymore.
They install used ones and call it a day. I have some valve issues that I have to take care of myself because no mechanic will touch the job. they fear after they are done ‘something else will go and you’ll need a new engine anyway”