Is Formula Shell pretty much identical to PYB?
No, its a lot closer to QSGB IMO but still not identical from what I've been able to tell from UOA/VOA's.
2004 Jeep Grand Cherokee 4.0 @ 121k Pennzoil HM 10w30
Napa Silver 31515
KIA Sedona 38k, Chevy Lumina 171k, Chrysler Sebring 171k, Ford Ranger 175k!