PQIA Noack test temp

[HKPolice]

I've noticed that recent Noack tests from PQIA have been @ 245.2c instead of the ASTM D5800 standard 250c

Pennzoil Platinum SAE 0W-20 Full Synthetic Motor Oil | The Petroleum Quality Institute of America

pqia.org

vs

PETROLEUM QUALITY INSTITUTE OF AMERICA TEST PROGRAM

The Petroleum Quality Institute of America (PQIA) is an independent resource for information and insights on the quality of lubricants in the marketplace. Our mission is to serve the consumer of lubricants by randomly sampling and independently testing lubricants taken from the field. Test...

www.pqiadata.org

Anyone know why this is and if the results could be compared?

My mind was blown @ how low PP's noack is now but then noticed the temp difference....

 

[JHZR2]

I’m just glad they do it. They don’t for all oils, which is a bit of a bummer.

 

[OVERKILL]

I would suggest reaching out to them and asking, I think it's a good question.

 

[kschachn]

There is a discussion of the different procedures within the ASTM test here, in particular the linked white paper for details on the temperature and how the different allowed procedures compare:

Engine Oil Volatility and ASTM D5800 - The Past, Present and Future

An oil with high volatility increases the volume of oil consumed by the engine, and the loss can change the oil’s effectiveness. The ASTM method D5800 Volatility by Noack was developed to calculate this loss.

www.savantlab.com

 

[buster]

It's going to change for GF-7 too due to poor correlation with oil consumption in the field.

 

[OVERKILL]

There is a discussion of the different procedures within the ASTM test here, in particular the linked white paper for details on the temperature and how the different allowed procedures compare:

Engine Oil Volatility and ASTM D5800 - The Past, Present and Future

An oil with high volatility increases the volume of oil consumed by the engine, and the loss can change the oil’s effectiveness. The ASTM method D5800 Volatility by Noack was developed to calculate this loss.

www.savantlab.com

And in there lies the answer, in one of the links:

https://www.savantlab.com/documents/58/VolatilityWhitePaper03-Selby.pdf

Thus, operating temperature necessary at the sensor in this configuration (later called Procedure B) had to be lower than the original Woods Metal Noack value of 250.0°C. Not surprisingly, it was found by the developers of this instrument that 245.2 ± 0.5°C was needed in order to approach Woods Metal Noack results.

 

[HKPolice]

And in there lies the answer, in one of the links:

https://www.savantlab.com/documents/58/VolatilityWhitePaper03-Selby.pdf

Ah thanks, so the results are comparable.
Pretty amazing how low 0w20 can go these days. Would it be safe to assume that PUP has even lower Noack?