We run 10w30 just need to stick to your regular oil change schedule.
As for Royal Purple I would not touch that crap witha 10 foot pole. I personally lost two engines when using Royal Purple. Changing it every 4500km with a new filter everytime it still built up in the oil pans in my Honda engines snd my buddies SE R. So thick I/we scooped it out with a spoon.
Adrian