Originally Posted by MolaKule
I think this oil would provide plenty of wear protection and film strength without consuming HP to move a 50 weight.
https://www.amsoil.com/shop/by-prod...e-30-heavy-duty-motor-oil/?code=ACD1G-EA
It has a High-Temperature/High-Shear Viscosity of 3.6 cP.
... and an amazing NOACK of 4.2 ! Not bad; best number for that I've ever seen. SL qualified for gasoline engines too, not just diesel.
The Ravenol 5w40's I recommended above have NOACK 7 to 8, and slightly higher HTHS of 3.75-3.8 (Ravenol VST or VSI 5w40). This Amsoil would definitely hold up, tough oil there.
Also, the Amsoil uses no VII chemicals to gum up the works.
Amsoil's NOACK = 4.2 is impressive, as mentioned, and I don't know exactly what base oils they use, but its a diesel & SL gasoline engine 10w30 oil just like Valvoline Premium Blue Restore which is known to have almost zero GroupIII oil in it with a NOACK = 5.4 . Wonder what base oils Amsoil uses then? Must be just fine anyway.
from
https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4839503 for Valvoline Premium Blue Restore 10w30:
Originally Posted by Gokhan
Code
20% PAO
50% polyol ester (POE)
10% alkylated naphthalene (AN)
0% viscosity-index improver (VII)
20% additive package
(Likely formulation according to the patent)
Polyol ester (POE) and alkylated naphthalene (AN) are base stocks with high solvency, which perform the engine cleaning.
The additive package is the standard used in other Valvoline oils.
Note the absence of viscosity-index improver (VII). It's technically a monograde oil.
It's a SAE 10W-30 HDEO with KV100 = 12.0 cSt and HTHSV = 3.9 cP. However, since it
has no VII, it can also be legally labeled as a SAE 30.
NOACK = 5.4%
If you think you need it, give it a try. It should work. Don't neglect to get an oversized (if possible), high-capacity fully synthetic oil filter.
Valvoline US patent US20170029734A1... deposits in internal combustion engines