Originally Posted by OVERKILL
Originally Posted by dave1251
Originally Posted by 4WD
Got it … same as 30% to 70% PAO … later
Originally Posted by 4WD
Got it … same as 30% to 70% PAO … later
It's not 30-70% PAO.
https://www.exxonmobil.com/en/passenger-vehicle-lube/mobil-1-0w20/pds-us
With a VI of 173, HTHS of 2.7, and a NOACK of around 10%.
It's not 30-70% PAO. If it were the VI would be a lot closer to 200, the HTHS would be tad higher and the NOACK would be 6-7%. Plus the PDS does not list anything near 30© PAO.
So when you decide to revisit this at least be prepared to be factual about the product you are selling.
What?
The VI of PAO isn't anywhere near that high, and the Noack for the low visc PAO's isn't that low.
A few examples:
SpectraSyn 4 has a VI of 126, Noack of SpectraSyn 6 has a VI of 138, Noack of 6.4%, HTHS of 2.08
SpectraSyn Plus 6 has a VI of 143, Noack of SpectraSyn 8 has a VI of 139, Noack of 4.1%, HTHS 2.58 but CCS only qualifies it for a 5w-xx
TGMO, entirely Group III based, had a ridiculously high VI due to high VII loading in a light base.
So a blend of 6 and 8 maybe (or maybe use SpectraSyn 4 with the 8 or 6) to get the 0w-xx rating, VII dose would be relatively low, and the VI wouldn't be overly high. And in fact this is reasonably consistent with the Mobil blending guide example of a completely PAO-based 0w-20, which is slightly less volatile and has a VI of 162:
This does not match the Mobil AFE 0W20 PDS I have. The
MRV @ -40ºC is significantly higher, the HTHS is higher, the viscosity at 40C is significantly higher and flashpoint isn't the same.