Originally Posted By: BrocLuno
Yeah, sure - I build engines too. But oils have changed a great deal since I started out doing that ... So it pays to ask questions just in case some new info comes to light
So PYB was supposed to be getting something like a third of it's mix from GTL overstock just a few months back ... But, maybe SOPUS has now streamlined their production process and the GTL is going where it was originally targeted and the PYB is now back to plane jane base chemistry, if anyone knows?
NOAK is a good indicator of possible inclusion of synthetics in the blend (high temp resistance). If the NOAK is going up, the percentage of synthetics is likely going down ...
NOACK is a good indication of synthetic basestock content as are MRV and CCV.
SOPUS may be using GTL GrpIII in many of its products not labeled as synthetic simply because this basestock is probably really cheap given that the cost of the feedstock is zero.
PYB does have a nice add pack and I'd have no problem using it, but I'd use Mobil Super as well. One would work as well as the other.