Pennzoil 5w20 Conventional Noack doubled in 3 years?

[Whammo]

I was looking at the PQIA tests of this oil. One was from 2013 and the Noack was 6.5 which piqued my interested. Then I looked at the 2016 test and the Noack was 13.1. Is this sort of variation common in testing this property or do you think it really has changed that much in 3 years?

Datasheets: 2013: http://www.pqiamerica.com/Nov2013/Pennzoil.htm

2016: http://pqiadata.org/Pennzoil5W20.html

 

[Carbon12]

That would be outside of normal variation. When it tested unexpectedly low at 6.5% it was thought that SOPUS had an excess of synthetic basestocks available and used them in PYB. 13.1% is not unusual for a dino oil

 

[OilUzer]

That's interesting. What is the definition of conventional oil? Just curious now. Not that the oil companies want to this but can you sell syn-blend or syn as conventional?

Edit:
Just remembered that I have Chevron Supreme 5Wx30 dino and the jug doesn't say syn-blend but the web site says it is syn-blend.

 

[csandste]

Most 5w20 and 5w30 is syn blend to meet SN+

 

[deoxy4]

I used to use PYB for its high TBN, good dose of moly, and low Noak when I could find it on clearance at AAP and Home Depot. I haven't used it since 2016 with their formulation change.

 

[Whammo]

Originally Posted by deoxy4
I used to use PYB for its high TBN, good dose of moly, and low Noak when I could find it on clearance at AAP and Home Depot. I haven't used it since 2016 with their formulation change.


So you can confirm that the current 5w20 conventional has the 13+ Noack? [censored]