I have found some of the answer, but I think I also found a mistype.
Here is a quote taken from a thread on BITOG about low NOACK for Pennzoil Ultra 5W-20 SN
Quote:
This was their reply to my email asking about the noack and test.
----
Dear Colin,
Based on the data, yes, they are correct. As for the Noack test, it
is done at ASTD D5800 at 250C.
Regards,
Technical Service, sn
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250*C is 482*F, beyond the flash and fire point of the lubricant. It would burn, no way they are testing NOACK at that temperature. Most likely, they are testing at 250*F. In that case, Amsoil tests at 302*C (150*C).
More tests comparing apples to oranges.
In the past six months, I have been told by those at Amsoil corporate that a new GTL (Gas To Liquid) process was about to be the new best base stock for a formulation. Let's wait and see who else jumps on the bandwagon with their best formulations.