I've used PP in the past, in the Advance Auto BOGO days.
It always seemed perfectly fine.
I have recently acquired a decent stash of it, with the Wally rebates, the SOPUS rebate, as well as Meijer clearing out the oil for as little as $1.49/qt.
Good stuff, and based on the used oil analysis on this site, it should at least equal the performance of Mobil 1 5w30 in use for moderate drain intervals.