No idea what you're on about, but different oils don't make engines run smoother, and even if they did, it would not mean anything.What does that have to do with what I stated? I said my engine runs smoother on something. Your responses so far have been that it’s impossible compared to an oil that meets a factory spec and now that it’s not directly correlated to wear. Can you point to any place I said it was? You brought the topic, not me, taking a shot saying I couldn’t tell the difference and that it’s not possible. I said I could. I never mentioned wear or anything else. I’m going to make sure my statements and reasons for them stay on point and not drift to everything else you want to drag into this. My mother use to argue like that.