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

https://pqia.org/pennzoil-platinum-sae-0w-20-full-synthetic-motor-oil/

vs

http://www.pqiadata.org/Pennzoil_Platinum_0W20_dexos.html

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:

https://www.savantlab.com/testing-highlights/engine-oil-volatility-and-astm-d5800/

 

[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:

https://www.savantlab.com/testing-highlights/engine-oil-volatility-and-astm-d5800/

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?