How low can U go

[ridgerunner]

ASF Amsoil commercial grade small engine oil in 10w40 is 3.7! We have a winner!

 

[SonofJoe]

Just for the record, there's a limit to how low you can go with regards to Noack. Even if you happen to have a base oil with close to zero Noack, you will usually get a positive net contribution to Noack from both the DI & the VII. Part of this will come from the diluent oil in both. Most additives are habitually thick and need thinning down to make them handleable. Also some common type of components blended into the DI package are themselves partially volatile at 250°C (ZDDP for example). Furthermore you also get some components that are downright weird like Phenolic AOs which have zero volatility but exhibit 100% volatility when blended into fully formulated oils.

 

[ZeeOSix]

The PQIA shows NOACK for almost every oil they test. Found this BMW 5W-30 that has NOACK of 6.2%.

http://pqiadata.org/BMW_5W30.html

Mobil Annual Protection in 5W-30 has NOACK of 8.5.

http://www.pqiadata.org/Mobil1_Annual_Protection_5W30.html

 

[ZeeOSix]

As seen in these side-by-side specs put together by the PQIA, it's pretty rare to see a NOACK of below 10. The newest comprehensive comparison I could find from them was in 2016.

https://pqiablog.com/2016-motor-oil-samples-side-by-side-via-viscosity-grade/

How about this one ... NOACK of 53.4%

http://www.pqiadata.org/SuperXXXPlatinum5W30.html

 

[Virtus_Probi]

Originally Posted By: ZeeOSix
As seen in these side-by-side specs put together by the PQIA, it's pretty rare to see a NOACK of below 10. The newest comprehensive comparison I could find from them was in 2016.

https://pqiablog.com/2016-motor-oil-samples-side-by-side-via-viscosity-grade/

How about this one ... NOACK of 53.4%

http://www.pqiadata.org/SuperXXXPlatinum5W30.html


Hey, but that Super XXX has good cold performance!!!!
;^)
At least the sand in it won't evaporate away (107ppm Si).
Man, I feel for anybody who puts that stuff in their car...