Well, IDK!
I have used the Pennzoil Conventional, a.k.a., Pennzoil Yellow Bottle(PYB) with great success and is held in very, very high regard here at BITOG. Mainly due to it's Walmart* pricing and rebate(s) to boot. Plus PYB had a very stout additive package for a conventional oil with a higher than average Total Base Number(TBN) to start with.