I think QS synthetic is a very good oil and was a good deal at $18 for the 5 qt. jug. Now that it went back up to $20 at my local WMs I'd probably use PP.
I used it once for a 5k OCI in the Malibu I maintain. Didn't appear to be any better nor worse than anything else I've tried in it. I take that as a good thing.
just got it at clearance at Laurel, MD walmart for $15.32/5qt jug
they made a new section just for clearances and there's all kinds of stuff there like $15.07 Rotella T5