Originally Posted By: burla
When NOACK is "excellent" but doesn't follow suit with the hths numbers is it more indicative of heavy vii's then PAO. Vii's can survive NOACK testing but the heavy heat of hths weeds out the fakers. I am all aboard being an Amsoil fan again assuming the commit to real synthetic like they used to, like Redline and Motul and a few others still do. That is why Redine has excellent NOACK followed by Excellent hths, completes a triangle of viscosity if you include operating temps that really gives you an idea on the quality of the base oils. I just find it odd when someone asks for real PAO this forum is not singing redline's name along with motul.
Redline has heavy for the grade HTHS in their 5w-30. Their 0w-30 is more indicative of a "typical" blend. I think you are off-base.
Regardless of your posit regarding VII dosing, that doesn't change the pour point numbers, which are again indicative of significant PAO in the base blend. You do realize that PAO is available in more than one visc right? One can blend a majority PAO GF-5 PCMO with a moderate HTHS just like they can use a heavier PAO base and create a Euro-oriented 5w-30 with a higher HTHS, which AMSOIL's 5w-30 Euro checks the boxes for. You cannot just whip out Redline's 5w-30 as some sort of universal PAO barometer, it doesn't work that way. Not every circumstance makes a high HTHS 5w-30 desirable, particularly when your target audience is using predominantly GF-5 ILSAC oils with Resource Conserving viscosity ranges.
Let's look at some of Mobil's products:
Now, that 5w-30 in that 2nd table, it's 82.9% PAO. Yet it has an HTHS of 3.2cP, which is not far off from the 3.11cP of AMSOIL's 5w-30. MRV is 12,000cP, CCS is 5,770cP, which is even higher than AMSOIL's at 3,968cP, NOACK is 6%, AMSOIL's is 6.7%. This points to AMSOIL using a slightly lighter base oil blend, particularly when one looks at the Pour Point, which, for their 5w-30 is -50C/-58F. In fact, if we look at the specific PAO-based PCMO that Mobil gives as an example:
We see a strikingly similar CCS viscosity, HTHS and actually, a slightly higher Pour Point. And this is an oil that's 70% PAO based with 10% AN mixed in.
So please provide some contradicting data to the above or perhaps acknowledge that your one-dimensional view here may not be accurate.
And not to pile-on, but yet another data point:
That's a high HTHS 5w-30 with exceptional CCS and MRV that's 11.74% VII, 63.36% PAO and 5% Esters and 8% NOACK.