bottom line.........unless you have an oil light flicker once in a while i would not bother rebuilding the engine. they are incredibly well designed and built.

5 beefy main bearings for a measly 4 banger that puts out 117 hp. no stress ever going to be on those bearing if they have gotten oil. the rod bearings are the only ones that really are susceptible to wear and they CAN be changed, awkwardly, but still, changed with the engine IN the car.

one this you might do BEFORE installing the engine in a new car is take off the oil pan and inspect the oil pipe return line o rings that connect the pipe to the pump and then into the block. they are under a dollar and can cause very low oil pressure if they dislodge a bit. it takes a10 minutes to check to be sure.