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Brands in question is Pennzoil and O'Reillys. Who makes the O'Reillys oil? Never have been one that cared to mix brands but is regular 80w-90 GL-5 all that different from brand to brand? The problem I'm having is my LSD is chattering in my Dana 70 with Mobil 1 Syn with the friction modifier already in it and wanted to try it with regular oil and Mopar modifier. 2 quarts are in it but it needs 3 but may run it with the 2 in it just to see if it quits chattering. I have one qt of the Pennzoil on the shelf and thought may as well use it......