Pennzoil dino 10w30 noack volatility question

[hominid7]

I was just reading several spec sheets for various 10w30's and 5w30's and noticed something curious. Pennzoil Conventional 10w30 list the volatility at 10.9. Could this be a typo? This seems unusually low, almost down in synthetic and high-mileage territory.

Is volatility alone a significant bench-mark for the quality of an oil (base oil and/or additives)?

The only other non-full-synthetic one i could find that was close was valvoline durablend which was 10.0. Most other dinos were in the low to mid teens (10w30 only). However many did not list it at all.

 

[addyguy]

Current Pennzoil spec sheets show it is actually higher, but still below the 15% limit.

Volatility is one thing that indicates the quality of the base-stock - lower 'group' bases have higher volatilities.

 

[zulu]

More related to base oils. Johnny commented a while back that SOPUS is using blends of GRP II & GRP III for YB and adjusting the ad pack to accomidate. I'm not suprised by a low NOACK %. YB is a STOUT oil.

 

[MolaKule]

Quote:
lower 'group' bases have higher volatilities.


Not necessarily. Volatility has a lot to do with the viscosites of each base oil in the base oil mix and the use of certain additives.