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Or is the 20th run as slow as the 1st run......
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I've run a wide variety of oil over the years, from Valvoline 5w30, Amsoil 0w30, Mobil1 0w30, Joe Gibbs XP1, among others. I run 55+ races a year, so I have quite a bit of data to form my opinions from. In terms of performance, the CAM2 is as fast as anything else I've run -- what I would call a 'full time' oil, something that I run in class or bracket racing, and can put plenty of runs on it with no worries.