Regular CASTROL (aka weedeater, chainsaw, outboard 2-stroke oil) protects too much? Its what I put in my pontoon boat.
Its not synthetic. I live 20 miles from nearest dealer, and don't want to drive 40 miles for oil. But if it is the concensus of this forum that Castrol (not CasTOR) will not allow the rings to seat, then I'll make the drive, as I trust ya'll completely.