no need to pull your head in freida - you're putting forward...

no need to pull your head in freida - you're putting forward discussion which doesn't base itself on whether a graph has zigged or zagged - that's a rarity on the forums today !

just keep in mind that the difference between light and heavy oils has to do with viscosity (or the natural flow of the oil at a set temperature) - one argument you seem to be putting under the same banner (and which is actually a seperate issue) is between sweet and sour oils which is the level of impurities eg. sulphur and then wax is another thing on top of this