Its an oil on the thin side of the "30" range for kv100.. Annoying how Shell Pennzoil doesn't tell us the HTHS for their oils though.
Even back a few years when PUP first came out, they never compared their piston cleanliness with M1 EP (or AP these days), only to Platinum, M1 silver bottle, Edge. ... Certainly a clean piston formula, yet likely on par with premium lines from Castrol & Mobil1 too.