Does anyone know if the Quaker State Advanced Durability is similar to Pennzoil YB? QS claims a 2x better friction protection than other conventional oils. Is this a "snake oil" claim, or is is true? I just changed over to PP in our Hyundai Veracruz suv, but if the QS is that good, I may go back to conventional. Any thoughts? Also, I find it a little odd that QS doesn't tout anything about "engine cleanliness" on the bottle. They seem to be going the "engine protection" route instead.