FWIW.....
If you compare the factory stampings on the bottle and even the shelf codes at WM, it appears to me that the MFG is not saftey kleen for all of Supertech products.
My reasoning is that the product codes for garden variety safety kleen oils (re-refined oils) have an SK at the front, just like the SOPUS products (PZ, Shell etc) have a different code at the front. I have noticed that the Supertech synthetic offerings don't have an SK at the front of the product code in the shelf labels and the computer batch codes on the bottles are also different.
Further, I do not know whether saftey kleen makes (or even has the capacity to make) a synthetic product or whether it buys it in bulk from SOPUS, Petro Canada or Esso and packages it for WM. Products from each of these Manufacturers is available in WM.
In any case, these are clues that have led me to believe that the 0w-30 is not actually a safety kleen product but is a re-bottled Petro Canada or Esso product. The bottle/batch codes do not look to me to have similar coding to SOPUS products.