We went to Rural King the other day for some supplies. Looking through the oil section, saw they now have the CK-4 Delvac 1 ESP 5W-40 gallon containers on the shelf. It was alongside the old CJ-4 stock.
After that went to Meijer, and looking at the oil there, they now have it as well. A few bottles sitting next to the CJ-4 bottles.
This is the first I have seen of the CK-4 formula.