I have went to two different WalMarts lately to replenish my oil supply. I like to keep several quarts in case something needs one I don't have to run to the store every time. First one didn't have anything but synthetic, and I don't use that. Second one, I had to buy three different brands just to get 6 quarts of 10w40, and got all they had of each brand. What is going on with Dino oil? Is it being phased out, or just hard to get right now? I don't want to change my stuff over because I've heard synthetic will leak out in a motor that has been run on Dino oil a long time, and the price is over double of Dino oil. I mean, they didn't even have any gallons of Dino oil in any brand, and just the few quarts. Anybody else run into this, is it just Walmart, or other stores too?