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10rwhp. I was watching and about to go to bed one night when I flipped and heard about them doing this test. They dynoed thild older v8 that put down 405rwhp and then swtiched all the fluid for Royal Purple. They changed the engine, tranny, and rer end oil and then dynoed the car again and got 415rwhp, just from oil. I switch from Mobil 1 to Royal Puple racing 41 and I can say I notice a big difference in my car. What Nixit said is true, its very niticable over Mobil 1, which already a very good oil. this tuff Rocks!!!
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