I bought this truck used in Sept '13. It was two years old with 16k miles on it. My wife uses it primarily around town, a lot of short trips and her drive to work is only 1 mile. However, we bought it primarily to drive from Chicago to Denver and visit our children. I have seen very high Fe numbers from day one. I attributed them to short drives around town. The last oil change was almost all highway. 3 trips to CO with associated runs up and down the mountain pass. (We Stay in Frisco, CO and visit Denver 1-2 times a week so its 180 mile round trip over Loveland Pass). I thought this last oil run would be better due to the increased highway time. It was worse and I think the heat from the mountain driving toasted the oil. The prior oil run thru May had a lot of short runs in a very cold winter. My plan is to move the OCI to no more than 6000 miles. I may due a real short change (2-3000 miles) before winter to flush out the system. I welcome thoughts on a plan for the truck, what the problem could be? Is it still breaking in? I may also change to Amsoil later this winter. Thoughts?