I have been doing some reasearch and after an exhaustive email trading fest with the Walmart folks I finally got the information I was looking for. The Super Tech Full Synthetic and conventional line of Walmart oils is manufactured for them by Quaker State-Pennzoil. I have been using Pennzoil Synthetic 5W-30 in my Deere F525 at nearly $4 per quart but now it appears that the Walmart stuff is the same oil packaged differently and at about half the price. I was kinda suspicious of using the Walmart Super Tech oils at first but now have no reason to be. Even the Walmart Super Tech Tractor and Hydraulic fluid is made by Quaker State-Pennzoil. Just thought I would pass along some information I found to be VERY interesting and informative.