Originally Posted by sloinker
Interesting how a 12+ Noack PAO and an 11+ Noack ester combine to create a 10+ Noack.
A similar effect is also seen in the PAO B formulation without blending with the ester. I think the DI pack (additive pack) and/or VII used has a very low Noack, which is driving down the overall Noack of the finished oil. Remember that most of the additive package is nonvolatile, and if they use thick oils or esters as additive solvents, Noack of the additive package could be less than 5%, which would drive down the overall Noack by about 1.5% or so, explaining the effect.