I have a question. Why is the price tag for Pennzoil dino higher than other oils? For example: at Walmart Penn. is 1.97/quart and Havoline is 1.42/quart. Thats like a 40% difference in price. What makes Pennzoil think that they can charge that much more when Mobil 7500 is only 20cents away and Havoline is 55cents cheaper? Is it the name, better refining, better base ol, or what? I'm just curious. If I were to buy Pennzoil I want to know what I'm paying more for. Thanks in advance.