Does the designer of this product know things about engine oil that no one else knows? They say that even if my car calls for 5w-20, I should really use their 5w-50 because they know better. They say, why change oil. Is the rest of the world going in the wrong direction? Should Honda, Ford and other just quit now, because they don't know what the're doing? And think of Mobil and others, how did they go so wrong? Or is synlube snake oil with a big price tag?