No oil stays on your metal parts, because when you turn your truck off the metal is over 200 degrees plus still, it all goes back to the pan. If your oil has Moly, you have a element protecting the metal, but it isn't as good as flowing oil. Redline doesn't make oil filters. I could go into the benefits of synthetic oil, but it would be pages I already have done in this thread. Go read the thread, most guys like reading it, and if you have any questions you need answering if I have the answer I would be glad to. I think what we have is a lab that makes many brands that has inadverantly used the wrong drainback, or put it in upside down.