Funny you mention that, my local DG has this STP oil too, doesn't look like a whole lot, but they still got some; likely slow moving stock
I'm willing to bet they don't make it anymore :P
But yea, if it meets the API specs (the donut on the back) for your vehicle, be rest assured it'll do you well as either a top off oil, or a full 4-6k OCI....likely SL or SM rated or somesuch.
Kinda cool how you walk into stores and each store has their own brands...
Went to target last night "on a whim" (I was in the area, and never really go into there.....) and obviously, went to the auto section, seems all they had was "Mobil Special" what appeared to be some sort of conventional oil
And yea, when I went to DG If I recall, there was STP, or some Warren product, so I took for the STP product, since I'm fairly familiar with Warren (distributor of SuperTech in my area...) and figured I'd give the STP a try, worked good as a top off oil 2 OCIs ago.