Originally Posted By: RISUPERCREWMAN
If I were you I would only use a MotorCraft Filter & run Pennzoil Ultra 5W-20 for 5K mile intervals!
I did this at first, but PU is quite OK for 7,500 OCIs (probably even past that, but I have a warranty as well to consider). I was "old school" and used to change at 3K (on former vehicles), but went 5K on the FX4. After reading and seeing "proof in the pudding", I ran two 7.5K OCIs and there is virtually ZERO difference between a 5K and a 7.5K OCI (1 or 2 ppm more iron in a 7.5K versus a 5K). In fact, I think I had one 7.5K used oil analysis that was better than one of my 5K used oil analysis--at least 25% of the miles on my truck have been pulling a heavy load in either 100F+ temperatures or
If the OP is short tripping for the whole year (7.5K), then I would worry a bit about exhausting the add pack, but a used oil analysis with TBN will easily allow the OP to adjust the OCI as needed.