Is royal purple that much better?
No, it's not better than anything. Read my posts in this thread. 0% Opinion, 100% facts.
http://wayalife.com/showthread.php?6985-Mobil-1-extended-performance-oil
I run Mobil 1 because it's always on sale at Costco, otherwise all my vehicles drink Amsoil.
Would it hurt to switch from 5w20 to 5W30 on a 2010? Both of our other cars recommend 5w30. Would like to only by one weight.