Anyone want to educate yourself on grouping of synthetic oils read here. Different oils are categorized in-groups by the type of base stock they are made from.
The hard part is finding information on where your oil falls. Nobody in the industry wants to be specific. However, on Bobstheoilguy many guys run oil analysis and have found some information on grouping. Anyone who wants to protect their truck and interested in extended oil change intervals, should be using synthetic whether it is group 3,4 or 5 (Redline)
When choosing the "best" synthetic, it is a choice between group 4 or PAO's or group 5 Esters. Here is all you need to know about the two.
Esters for Lubrication
The bottom line is these are the best, but is it necessary to go over board with lubrication for a gas engine? That is every persons personal choice, I say if you change your oil every 3k miles you should just buy the cheap stuff. If you go 10k plus on oil changes you have to be crazy not to use either group 4 Amsoil & Royal Purple or group 5 Redline.
Spread the word.
Here is the reason I stop using Mobil One, they simply will not answer the question if they are group 3 or group 4. From Mobil One website.
I have no doubt that Mobil One is high quality, but I doubt it is group 4 anymore, if it was they would proudly say so, lol!!! I wouldn't hold it against them, they all do it except the very specialized oil companies like Amsoil, Redline, and a couple others.