TropArctic 5W30 synthetic blend has disappeared from my local Wal-Mart...not even a place on the shelf for it anymore. They still have some 10W30 synthetic blend. Is this an isolated case...has anyone else seen this? I heard that a ConocoPhillips refinery in the Gulf took a big hit and will be offline for awhile...I'm wondering if this oil is one of the affected products. I stocked up awhile ago, so I'm good until Spring.