Any reason why Royal Purple isn't popular in the US? Everyone used to run it in their Evo's in Australia after some magazine did a wear test on it and it had the least wear after repeated abuse by far (but to be fair it wasn't very scientific and didn't even do an oil analysis like what Drew1 posted).
Either way though, I found it reduced lifter tick considerably, but I'd still change it out for 300V when I went to the track. Since moving to the US I've run Redline.