I have a 4 cycle twin ( Kavan 50) that I have run on Glow fuel and it seems to up the level(possibly from piston blow by) in the crankcase, which has a dip stick. With higher contents of oil in glow fuel...you may not need much or not even any oil in crankcase? I do not know this...never had a Ryobi 4 stroke running on glow. Best Regards Capt,n