just to compare I use Pennzoil Ultra Platinium,5w-30,SP,GF-6A , the HTHS is un-published, the ccs is 4000 at -30 astm 5393,,the mrv is 10,200 plus the pour point is -48 c,,,I would suspect the HTHS is around 3.0 ???,,looks like the PUP maybe a better flowing oil at low temps and pump up...