Howdy fellow oilers: Has Walmart/Supertech stopped making 15W40? I can't find it at either of our two local Walmarts. I was in Orlando Florida this past week at a conference, and while everyone else went golfing or "other places," I went to the local Walmart and checked out the oil section. They too did not carry Supertech 15W40. Did Wally World stop carrying this weight?