I assume Patman is referring to the Dino Oils. I would gree with that-but wouldn't go any further. Who knows with the Walmart Group III - no information available. Mobil 1 - safe is a relative term. Probably totally safe is 6K. But reasonably safe would be 7-10 K miles. Possibly safe-maybe- would be 10-14K miles. Really haven't seen Mobil 1 beyond 15K miles. I like to see an analysis at about 6K miles or so. And before I would drive 5K repeatedly with dino to 5K miles-I wold like to see an analysis.