Marine 2-cyle oil with tcw-3, 1 ounce per 5 gallons. Been doing it for years. In my Harley, Nomad, Indian Chieftain, Jeeps, mowers, blowers and anything that runs on gas. I've been nailed to the cross for talking of this in the past, but if you have the time, read this.
http://www.ls1.com/forums/f48/been-testing-oil-91206/