Red Line versus Valvoline versus Mobil One?

[RJ]

Originally Posted by Bill Edgeworth

You cannot count on what worked best for someone else being best for your motor unless you have the exact same combo, same lifters, same rings, same clearances etc. you could throw 0-3wt pro stock oil in a solid cam motor an make more power but what’s it going to do in a hydraulic cam motor? With Sherman lifters? With Shubecks? With stock lifters? Probably fall flat on its face. Unfortunately the only way to really know what works best with your combo is lots of expensive dyno time! You also can’t change the oil on the dyno and expect to see the exact results on the next pull it takes a few runs for it to work in and see how it affects things like you ring seating, lifter bleed etc.
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This is spot on, there are way too many variables as is mentioned, along with bore finish, that may contribute to a certain oil performing better than the rest. You need to do your own testing to really know.