Tough question. Even with a PPI, stuff happens. All you can do is reduce the chances for the obvious and testable at the time items. A lot depends on the quality of the PPI. I spent probably 3 hours of labor costs and the guy preped P-cars for racing and his shop was filled with engines in one state of assembly or another. I had seen his 3 page PPI sheet and so I knew of the measurements he'd be doing. The guy doing the job matters ... how many times have you heard that.
I'd suggest finding the mechanic before the car. Often they can point you to a car whose history they know and whose seller motivation they can attest.
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