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One thing I didn't like about the 100:1 was how bad it mixed with gas. I poured the recomended amount into a clear 5 gallon fuel jug and filled it up with gas. I noticed the blue Amsoil oil was still stuck to the bottom of the jug after it was full. I had to shake it real hard several times to get it to mix. The next time I filled the jug with about 1 gallon of fuel, then poured in the Amsoil and finished filling the jug. The Amsoil had poured threw the gas and stuck on the bottom. I also had to shake the jug to get the Amsoil to mix. This was a big negative to me. For an oil to be mixed as light as 100:1, it needs to mix compleatly by the time I'm finished filling up the tank on my boat, or my outboard might seaze.
I tried the Amsoil 50:1 and it mixed like any other 2 stroke oil.
You weren't the only one. At a annual experimental airshow, fly -in in Arlington WA a few years ago, they provided pump premix for the twostroke guys. Someone got talked into mixing it up with amsoil 100:1. By the end of the weekend many engines had seized which was directly traced back to the oil coming out of mix in the premix tank. This created a big scare and (right or wrong) to this day many guys won't use synthetic or amsoil in their two stroke airplanes. Shortly after this incident amsoil added "miscibility" to their ad verbage, not sure the oil changed, but they most likely wanted to dampen any concerns.