Anybody using Driven brand HR-2 oil in their slant?

I've heard that off the shelf NAPA store brand oil is perfectly okay in these motors.
That's absolutely right. For less than half the cost, get the lowest price synthetic 5W-30 or 10W-30 at Napa or Walmart or Costco or Amazon or wherever you shop. For a stock slanty, that Driven is overkill. For peace of mind, and to stay in the good graces of your engine builder, maybe run it for one oil change in case something goes wrong during or just after break-in.

And NAPA oil used to be Ashland (Valvoline) back when I managed the Savage and Egan stores (early 90’s). May still be the case, but I no longer know for certain.
Last I knew, Napa oil was made by Valvoline. But Ashland spun off Valvoline into its own company, which was recently bought up by Saudi Aramco.