The "cheapest" crap is almost always recycled oils....meaning they filter/"distill" the fluids, put dyes in it(usually a purple color), and bottle it back up. At that point, the additive package originally blended into the fluid is gone...what is left is just the base oils. 90% of these fluids also have some type of seal expander additives(ie: brake fluid) added to them...a "Stop Leak", if you will. Not really what ya want running thru your fuel lines/hoses, and into the carbs that have rubber items in them.
I prefer to use a "name brand" fluid...the store brand stuff might not be what ya think it is. I don't mean the Pep Boys, or AutoZone, etc. brands here, I'm talking about the convenience store/gas station stuff....that's the stuff to shy away from, imo. :nea: