Adam speaks exactly what I feel mikey. do u have any oil loss/burning issues? If not probably not worth worrying about.. But for peace of mind could always borrow a bore scope To see state of pistons..
Agree with Phil on this mikey And I believe Adam is correct 140 is the service limit. If you are really worried, whip sump off and see if and remnants of rings in sump. plus take the result with a pinch of salt,
I'm racking my brains trying to remember, the parts it could be. It appears so far everything's fine. As ran for 15 min plus Friday and no knocking noises..