I've got my own issues with Powermaster, but it was from about 7 or 8 yrs ago. PM had a bad batch of fuel(YS20/20), causing many YS 120 owners to burn up their engines. I found out on the net before using any of the case of fuel I bought. I called PM, Don Nix asked for the lot#, said yes, it was defective and shipped me a replacement case. The problem is, PM wouldn't replace any of the burned up $400 engines, which I find reprehensible given that PM admitted it was defective fuel. The really funny part is, the replacement case of 4 jugs started leaking(all 4 plastic jugs). Needless to say, I wasn't going to use it in my YS, ended up using it in a .45 2 stroke that I didn't care about. It worked fine, but that was my last use of Powermaster and I highly doubt I ever will again.