I just put the 300V 0W-40 in my FXT. The new Ester Core has less anti-wear additives than the old stuff and relies more on the eater base stocks for anti-wear. I'm doing a voa on it soon.
I know there are a few folks over at FT86club using 300V 0W-20 with no consumption. They don't need no steenkin' API certification!