I work at a pretty large oil refinery and we use a lot of Royal Purple oils in our large horsepower motors and pumps. There are only a few that spec a certain type of Mobil oil, but the majority get Royal Purple. I know, apples to oranges, it’s not motor oil, but for the simple fact that they could be using any kind of oil they want too and they choose to use RP has to say something about it I would think? I’ve used the Walmart RP a hand full of times, but I’m so easy on oil I don’t see the need to spend the extra money on any extra protection it may or may not have when a “regular” synthetic will do just fine. At the end of the day run what you want to, I’m not a fan of letting others tell me how to spend my money
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