Your response gave me a reason to refresh my understanding of motor oils and look at my now dated data. I've printed out new specification sheets for a number of oils, and I would've done more had I not been busy yesterday.
You are correct that Pour Point value is no longer indicative of low temperature viability as the Pennzoil spec. sheets indicate for their Platinum and Ultra Platinum. This may surprise some, as it did me, that Pennzoil Ultra Premium 5W-20 actually has better low temperature CCS and MRV viscosities than the 0W-20 version. Of course, there has to be a tradeoff to do that and it shows up in the Viscosity Index number. And 5W-20 is G6 and 0W-20 is a G5 ILSAC.
So now my Excel files are probably worthless, except for history!
Thank you for the discussion.
Best regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33 gallon fuel tank, factory dual exhaust, 18” wheels. Build date: 03 June 2018. Now at: 045407 miles.