My wife bought me a Ryobi 4 stroke weed wacker. No more mixing gas and oil! Now for the questions. This thing came with Eco-4 oil that claims to be bio-degradable and safe for the enviroment. Fine but it says nothing about how well it works as an oil! Can I use the same Mobil 1 4-T oil as the rest of my thumpers? Also this thing sounds like a ....well a weed wacker. Does anyone like F.M.F. or Big Gunn make a slip-on? I want people to know I'm out there working.