My novice eye reads the specs for both Schaeffers 701 Supreme and 100 Micron Moly as being pretty darn close except for the viscosity index. Can I get some opinions and advice on those two? Vehicle is 2001 F150 4.6 ltr Romeo. I strictly adhere to Ford service interval of 5000 mile changes and have been using OE Motorcraft FL820s (or KN Gold) filter but may switch that to a Wix, NAPA Gold or Delco SPF1250 to try and get more flow through the filter. I have been hearing that awful knocking at cold startups when temps are down into the 20s and below. it goes away in about 4 seconds but still, it's killing me. I've read other posts here with the same issue and different filters haven't really helped but I'm willing to try anyway. Currently using Amsoil 0w-30 with Motorcraft FL820s and still the cold start knock continues. I just ordered the sample kit from Blackstone Labs and will be sending it off to them at next change (25,000 mile scheduled service).