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Originally Posted by vinuneuro
This is good stuff! I too love reading on Bobistheoil.com.
As far as Sytnec goes: 5W-40 is actually LL-98. 0W-30 is the LL-01 approved oil as per Castrol website. One oil that I forgot about is the Mobil1 Extended Performance oil (Mobil rates it up to 15k), but can't find out if it's LL- approved.
As far as M1 goes, the only ones I would use are 5W-40 and 0W-40, which do shear down to a 30wt after a decent amount of use (yes, M1 30wt oils do get quite thin).
Amsoil is not a "widely available oil" because you need to get it from a dealer. People have had great results, when analyzed, with Castrol 0W-30, also fondly known as German Castrol (GC). I remember, GC used to be green at one point out of the bottle.
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My understanding is that the only Castrol 0w-30 that was LL-01 approved was the German Stuff which they stopped importing. The current 0w-30 is supposedly not LL-01. Bottom linke check the bottle.
The Mobil EP oils are not LL approved. Only the 0w-40.
The 0w-40 "shearing" is a bunch of crap. It started because some guy with a turbo 1.8T had a ton of fuel dilution that led to the viscosity dropping. If you follow the UOA's for the 0w-40, the only ones where is dropped out of grade are those where there was fuel dilution.