So i just had my 502 rebuild and i was wondering how long it will take for the rings to set. It has 25 hours and i've only used convential 30w oil. No synthetic because i was told it would wash out the rings? is that true? and if so how long do i have to wait to run synthetic? Thanks

Your fine by now !!!!!!!!!!!!!!!!!

Once u take the boat out ,,they are all good.

With todays rings and the proper finish on the cylinders, the rings are seated after 30-40 minutes of running. You can switch to synthetic if you wish.
Eddie