Pennzoil conventional seems to get a lot of love here on the forum. Perhaps deservedly so. I am running it right now as a "rinse" phase following an Auto-rx treatment. I just looked at stats on Mobil 5000 in comparison to Pennzoil conventional on PQIA's site. The Mobil 5000 had a higher TBN, more calcium ( a detergent?) and a much higher moly count than Pennzoil conventional. It would appear from the stats on PQIA's site, and I am no tribologist, that Mobil 5000 is a comparable if not better oil than Pennzoil conventional. It can probably be had much cheaper than Pennzoil conventional, depending on where you shop. When Mobil 5000 is mentioned here it is referred to as an "ok oil, good enough for a 3k oci". What am I missing?