Originally Posted By: JohnnyJohnson
Originally Posted By: JAG
Amsoil Signature Series, in xW-20 and xW-30 viscosity grades, has at least two attributes lacking in oils by the majors in those viscosity grades: significant ester content and very high TBN.
Just how significant is that ester content and what is that very high TBN?
No one can be sure on base stock content percentages, since they will
ALWAYS BE told "that is PROPRIETARY" by the company, and no one is going to pay out of their own pocket for a spectral analysis (or
whatever type of analysis is required to determine actual base stock contents) to find out for sure.
But the very low stated NOACKS of most of the Signature Series oils do
indicate/infer a base stock of much PAO/POE content.
These oils'
very low NOACKS and high starting TBNs (which
few,
if any of the readily available "on the shelf at Sino Mart" oils which everyone loves to tout, possess), have me considering them for my winter OCI next year in the 5W-20 flavor, for my 1.6 EcoBoost.
BTW; that stated starting TBN is 12.0, which very few non-boutique oils (and even a lot of other 'boutique oils') even come close to matching, especially with a 1.2 SA reading or lower.