I have finally reached approximately 10k (9953) on my truck new since 3/10. I did change the filter and add a half a quart of mobil 0w-20 at 7k. For the last thousand miles or so, I have noticed the gas mileage was down about 1 mpg. After oil change, I have gained back that 1 mpg.
The dealer I use offers lifetime oil changes, but on the invoice it shows they only charge $42! You cannot touch that by buying oil from Wally World. Yes they buy in bulk, but I had to wait an hour and a half for a 20 minute job that I made an appointment for. (I watched the tech lumber through the whole job when my truck was finally brought in). Now, that all the wear metals should be out, I will get a sample at 20k for an oil analysis. Stay tuned in another 8 months!