High noack% for Fully Syn = low quality base oil?

[Trex101]

Is Noack 11.5% consider high for a fully syn 5w40? as it is only slightly better than mineral Mobil 5000 at 12.8%

Does it mean that this oil is most likely blend from light viscosity base oil couple with tons of VII to make it a 40 weight viscosity?

Carlube 5w40
Density = 0.850
Vis@40'c = 84.7
Vis@100'c = 14.3
VI = 176
pour point = -33'c
flash = 228'c
Noack% = 11.5%
Sulphated Ash = 1.22%
TBN = 10.1

 

[The Critic]

Not sure, but PP is popular around here and it has one of the highest volatility values of any full synthetic.

 

[Trex101]

I assuming a good synthetic oil should have low noack% because they are using less VII to get to certain viscosity desired. I'm assuming this because a fully syn 0w30 will always have a higher noack% then 5w30 or 10w30.

 

[Quattro Pete]

Even PU 5w-40 has NOACK of 11%.

 

[sangyup81]

NOACK will be higher for any oils that use Group III instead of Group IV and Group V. If you really care about NOACK, you'll be served best by Amsoil or Red Line

 

[Trex101]

The reason i'm asking this is because i'm wondering if the high noack% is cause by using low viscosity base oil(low quality group III or lower) to meet 5w flow limit couple with loads of VII to maintain 40wt viscosity at 100'c.

If the manufacturer is using high quality PAO or ester base blend like Amsoil 5w40(noack 8.7%) or Redline 5w40(noack 6%), the noack% would be much lower.

Is this idea sound?
high noack% = low quality base oil

 

[TwsT]

Originally Posted By: Quattro Pete
Even PU 5w-40 has NOACK of 11%.


Schaeffer #9000 5w40 also NOACK 11%.

 

[Mokanic]

Originally Posted By: TwsT
Originally Posted By: Quattro Pete
Even PU 5w-40 has NOACK of 11%.


Schaeffer #9000 5w40 also NOACK 11%.

And neither have burnoff issues in sound engines. I'm not sure what the NOAK# really means in the real world.

 

[salesrep]

"An engine oil’s volatility characteristics are directly related to the type of base oil used in the formulation of the engine oil

The volatility characteristics of an engine oil as measured by the ASTM D-5800 Method have been found to correlate with oil consumption in passenger cars and heavy-duty diesel engines"


13% is the max allowable limit for,cj-4 40w,acea e7-08,e9-08,cummins ces 20008, mack eo-o

A recent test had Schaeffers 9000 5w-40 at 10.86, Shell Rotella t6 @12.32 compared to some 15-40's valvoline premium blue 11.55,chevron delo 12.25,John deere plus II 10.86, Delvac 1300 10.74,rotella t 12.4, Schaeffers 700 9.68

 

[Trex101]

Oh, i got it now.

That is why even though Schaeffer 9000 5w40 are fully syn, it still has a higher noack% compare to semi-syn 7000 15w40 due to the 15w of the 7000 series.

In terms of film strength and protection, the semi-syn 7000 is definably on par or even better than the 5w40 in moderate weather condition.

 

[Eddie]

Theory aside, then why does Pennzoil Ultra have a higher NOACK % than Pennzoil Platinum? I think it is NOT all related to base oil but, to the additive package.

 

[StevieC]

It's largely comprised of the basestock but Add-pack also plays a roll.