Well, it looks as if I need to find a new oil. I went to WalMart today, they have no Chevron Supreme 5w-30 in stock. There isn't a tag on shelf for it anymore either. According to the manager, they are no longer stocking the 5w-30. The oil is for a 1997 Ford Explorer, 4.0L OHV. It has 88K miles now. This engine is spec'ed for 5w-30. I'm wondering if I could run Motorcraft 5w-20 in her? I can get that for $1.77/quart at Walmart. The UOA's I've seen posted here for this oil seem to be very good. Plus with winter coming up, I would not mind the increased flow either. So, what do you guys think, 5w-20 ok in this 88K mile engine spec'ed for 5w-30? Or, should I start looking for another 5w-30. Thanks!