I think Costco may have dumped or is in the process of dumping Chevron Supreme to make room for Kirkland oil. Their website also says "warehouse only" ... Whereas you can order Mobil 1 or Kirkland. I haven't seen it in the 3 Costco in our area. Now I see Kirkland oil. Good thing I bought a bunch when they were $10 off. I like that oil. Do you guys see any CS in your Costco?