I have an engine that wore out the crank pin in about 30 gallons of fuel while using Redline Allsport oil at 50:1. The viscosity of the oil is very very thin, like water. After the engine was rebuilt, I switched to Honda HP2 and then Mobil synthetic, both at 32:1. No engine wear problems since changing oils, and I've burned a lot of fuel. I also noticed with the Redline oil that something always settled out on the bottom of the clear bottle - that can't be good.