Crankshaft on engine over 50K
 

I need some help to see if anyone else has come up with this issue. To replace a crankshaft on a guy is telling me that it is not wise due to very likey to spin a rod or main bearing due to unevenly worn surfaces. I am being told that a low mileage used engine. The used engine with 65K miles with a year warranty and cost of $1500. I have already paid to repair crankshaft and now this amount is on top. Help!