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Message: <blockquote data-quote="Quackrstackr" data-source="post: 140001" data-attributes="member: 437">Because the guy stocking the shelf at Wal Mart is actually a chemist and knows the differences between Pennzoil and Supertech and secretly watched this happen at the refinery?  :lol: Guy, don't believe everything that you hear without doing a bit of research first.  They may come from the same refinery (maybe, Wal Mart contracts their oils to the lowest bidder) but that does not mean in any way, shape, form or fashion that they are the same oil with two different lables on it.  They have their own formulation to meet whatever spec suits them and bring their price point in at the bottom of the barrel.  This is where it currently comes from: https://www.warrendistribution.com/This myth has been debunked hundreds of times on the internet on various boat and automotive forums by guys a lot smarter than me that formulate oil and work at those companies.Does it work?  Most likely.  Is it as good as the name brand stuff?  Maybe, maybe not.  Can you tell who made it from one year to the next?  Only if you go digging.</blockquote>