Well no one seems to agree on the best 2 cycle oil. So my question is... who makes the worst? Is there a two cycle air cooled oil (name brand)that has been proven to be bad? Please stick to well know brands such as equipment manufacturer brands (stihl, echo, husky, Shindaiwa, etc) or established brands such as Pennsoil, Amsoil etc. Are there any test to prove an oil like Walmart brands do not meet specs? Are there some oils that work OK but smell like crap, or foul plugs, or cause a build up? Just trying to turn the question around to get a different point of view.