Just received the lates Amsoil magazine. Group III and IV synthetic sales are up. It isn't out of reason to think that group III could make a come back. I bet if M1 wasn't a group III, the market might have gone and stayed in that direction. I noticed the latest charts now have Mobil 1 SS at 2.06 for the four ball wear and Amsoil a .44. How on earth does this apply to a real engine? It's never been really explained how or what the four ball wear test means? Both Redline and Mobil disclaim it and say it has zero to do with real world operation. Based on used oil analysis, I believe it. I know it's a test for grease but why is Amsoil using it like it really applies to how well an oil will protect? Their marketing frustrates me, unfortunately.