The observed oil temp is really just an average temp, there's a lot of places where the oil is getting cooled, and others were it gets heated. 350+°F in some places is not unlikely, under normal operating conditions
Does oil NOACK volatility really matters that much?
- Thread starter jurko
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The observed oil temp is really just an average temp, there's a lot of places where the oil is getting cooled, and others were it gets heated. 350+°F in some places is not unlikely, under normal operating conditions
Thanks Buster. The new test will not be ready for GF-7 but should be for GF-8 if a correlation is accepted. I always thought that 1 hour at 250°C only stripped off the light ends and didn't match engine conditions. Happy to see a change for better correlation. For our jet engine and industrial oil formulations we used 22 hours at 204°C, although 150°makes more sense for motor oils.
"Modifications to the Noack volatility test, which determines the evaporative loss of engine oils related to evaporative oil consumption, may be required. Recent research has indicated that standard Noack tests do not correlate well with actual engine oil consumption. Deegan detailed a change to the temperature in the volatility test from 250°C to 150°C for an improved engine to bench correlation. SAE Paper 2022-01-05241 has previously demonstrated a good correlation with evaporative oil consumption in actual engine operation with a modified Noack test at 150°C."
https://www.fuelsandlubes.com/fli-article/ilsac-gf-7-implementation-tentatively-planned-for-q2-2028/
I Used to chase Noack. Still do ...
The lowest Noack I used to see was for Amsoil SS 10W-30 with 4.1 and no vm!
Another good one for the price was Castrol GTX Magnatec Full Synthetic 10W-30. I think Noack was in the high 6 or low 7 range. Maybe 6.7 or 7.1 or 7.6 ... iirc, Magnatec has retired.
These days, the oil companies seems to hide the Noack data.
Management:
Customers are getting smarter, hide the info.
The lowest Noack I used to see was for Amsoil SS 10W-30 with 4.1 and no vm!
Another good one for the price was Castrol GTX Magnatec Full Synthetic 10W-30. I think Noack was in the high 6 or low 7 range. Maybe 6.7 or 7.1 or 7.6 ... iirc, Magnatec has retired.
These days, the oil companies seems to hide the Noack data.
Management:
Customers are getting smarter, hide the info.
The current Red Line has the lowest I've seen for all grades. They always match the VOAs I see too. There was a recent Euro 5w30 and it had a Noack of 4%.I Used to chase Noack. Still do ...
The lowest Noack I used to see was for Amsoil SS 10W-30 with 4.1 and no vm!
Another good one for the price was Castrol GTX Magnatec Full Synthetic 10W-30. I think Noack was in the high 6 or low 7 range. Maybe 7.6 ... iirc, Magnatec has retired.
These days, the oil companies seems to hide the Noack data.
Management:
Customers are getting smarter, hide the info.
Personally I’ve always associated a low Noack with high quality ingredients. Nothing scientific, just an opinion.
using this right now:I Used to chase Noack. Still do ...
The lowest Noack I used to see was for Amsoil SS 10W-30 with 4.1 and no vm!
Another good one for the price was Castrol GTX Magnatec Full Synthetic 10W-30. I think Noack was in the high 6 or low 7 range. Maybe 6.7 or 7.1 or 7.6 ... iirc, Magnatec has retired.
These days, the oil companies seems to hide the Noack data.
Management:
Customers are getting smarter, hide the info.
https://www.ravenol.de/en/product/m...orenoel/ravenol-motobike-4-t-ester-sae-10w-30
| Noack Volatility | %wt. | 3,3 | ASTM D5800 |
| Flashpoint | °C | 260 | DIN EN ISO 2592 |
dnewton3
Staff member
As I understand, there are some boutique lubes which resist evaporation so well that they are difficult to even register using the common NOACK test. Such as the lubes from our friends in Manteno …
I’ll leave the explanation of the chemistry to the experts.
I’ll leave the explanation of the chemistry to the experts.
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Slightly off topic, but why does the 0W-20 have higher Noack than 5W-20? Have seen this before where 0W-20 usually looks like a superior product.
Where do you see that?
I see 5 for 0W-20 and 8 for 5W-20.
Do you mean 0W-40 (8) vs. 5W-40 (4)?
I see 5 for 0W-20 and 8 for 5W-20.
Do you mean 0W-40 (8) vs. 5W-40 (4)?
to get that wider spread you're typically going to have to use a thinner more volatile base oil and more viscosity improver.
Sorry, I meant the other way around, why does 0W-20 have lower Noack
Exactly 0W-20 should have higher Noack based on that, but does not.
I think it's better quality base oils to make up for it which end up being better in the end. That's my guess anyway
If you drive a vehicle with a DI engine (no port intake valve wash over assist) then lower NOACK and lower VII’s should help lower potential intake valve deposits . So , in theory and practice the M1 Euro oils should be cleaner to run versus SP and D1Gen 3 oils in a DI engine ?
OVERKILL
$100 Site Donor 2021
All things equal, the oil that allows less "stuff" into the intake is going to produce fewer deposits. That may be the case with the M1 Euro oils, but I don't think we can draw that conclusion just from lower Noack alone.
In the past I'd seen with like mobil 1 where the 0w-20 was almost entirely GTL or PAO base while the 5W-20 would have much less PAO/GTL and more group III mineral oil.