I've always said the same thing - pick a brand and stick to it.
You can't compare across brands, as they will vary. They probably shouldn't, but they do.
I suspect every brand has the odd bottle that goes out with the wrong label on it, so I think you're susceptible to that with everything in my view.
I used Schumacher and Core oil when I drove for them with no obvious concerns. I now use AE oil as I drive for them, again no obvious concerns.
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Matthew White
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