WPP seems to be the goto blender for store brand and off-brand oils.
The oils seem to be of consistently good quality, perform well in UOAs and have decent virgin add packs.
I would not bother with Supertech or any other store brand oil unless it were really dirt cheap.
I have some WPP made Meijer brand HM 10W-30 that I'll use for a couple of runs in the older Subie and then UOA.
I suspect the oil is well formulated, as WPP products seem to be.
The oil was ~$17.00 for a twelve quart case on closeout, since Meijer was going to six quart cases at the time, and both case sizes had the same bar codes.
I had to buy it at the price, and it will be intersting to see how the oil compares after use to the PP I just drained from the car and sampled for a UOA.
The car has GTX HM in it right now, which I won't bother to UOA, since I only have enough of it for a one off run.
I doubt that you'd have any problems with ST oil in your car, but there are better oils at better deals available.
How about either QSUD or G-Oil FAR?
You can also get an FAR MIR on NextGen from AAP.
Check the relevant forum for these deals.