actually to start the argument meter,,, many pro shops state that a dirty oil filrer filters better!!! Now I am not saying to do what the manual say's and change the filter after three oil changes (every 3rd oil change the filter as well) I am the nervous nelly so to speak and I run full synthetic and change oil every 3500 miles and the filter every other time. so the filter when I change it has 7000 miles on it. but the oil every 3500 with full synthetic always. I know people are saying why change the oil at 3500 if your running full synthetic, my answer is my mind will not allow it to go further than that, I ride it hard sometimes and its worth it to me. To quote you Rick Ekstrom, I use to run a Fleet of vehicles (over 500) and have done many oil analysis so I'm very familier with this subject. My road tractors (semi's) go a minimum of 500,000 miles before they get a inframe overhaul using 10,000 mile schedule and non synthetic oil. Then you know that Rotella blue jug full synthetic is just as good as ANY full synthetic oil and is much cheaper!!! But dont belive me do an oil analysis on it or go to
Welcome to see for yourself... I had a mechanics shop do a valve adjustment on my 2007 with 28,xxx ish miles on her. They did a leak down test on it and I was 3-4 % worn in on the rings!! no lie The hype on amsoil or what ever brand is just that, although some test did show that amsoil or royal purple could help with horse power with 1 -2 ponies but you will not feel 1-2 hp unless you are on a dyno to see it. Just my 2 pennies but it is all fact look it up