I use many different oils in my personal "fleet". If I were to run just 15,000 miles/year and were stuck at a "tweener" point I'd just run the Amsoil with EAO for a 12 month interval and UOA at 6 months. I've used Amsoil products for over a decade now off and on in vehicles that are of high value to me and have pushed them over 20,000 + OCI on multiple occasions without UOA...the vehicles never had oil related issues and one of them that my neighbor bought from me just went over 187k miles this year with only nickel and dime maintenance (water pump, alternator, fuel injector pod etc.). Amsoil change overs have never surprised me with consumption issues, odd noises in the valve train or any sort of seal leakage to date (knock on wood that they stay the course). Now if I pick up a winter beater here and there to put 4 or 5k miles on during wreck season it's getting the thinnest brand name dino juice and bargain filter I can find to meet its needs. But when I want proven consistency, and more free time away from the creeper(form personal experience), I order up the "juice" from Superior, WI.