I share this for those of you that can be open minded on breaking from established paradigms...
My oil analysis came back fine at 8640 miles using synthetic. This is following the last time I changed at over 15K miles as seen towards the end of the following post.
https://www.expeditionforum.com/thr...cam-follower-issues.37958/page-10#post-350337
This time, due to my son's error - I am not running my regular choice of oil - Mobil 1. This time it was Mobil Super Synthetic. I was comfortable with the 15K interval with Mobil 1 based on the last results (and my prior experiences), but since the difference between these two oils is as clear as mud, I thought I'd do a check near mid cycle to make sure all was well. Needless to say the oil is still in the truck, I'll likely go to 15K again based on this report.
PLEASE NO ONE START THE INSULTS. We are all (I hope) mature citizens that can choose on our own. I choose to run longer intervals because most of my adult engineering life I've learned that's what these oils can do. I'm simply sharing this as information for others who wish to save a nickel or enjoy the academic exercise. For those of you that think this is heresy, I respect that. I do not wish to argue with any of you the merits or demerits of our choices.
I will post again at end of oil life or perhaps 12.5K miles when I draw another sample and have it analyzed.
To summarize, we have 1 sample at 15K miles in my expedition with Mobil 1 that was fine, but likely time to change. We now have another sample with Mobil Super Synthetic at it 55% of that mileage, with IMHO the attendant reduction in wear materials.
Use the information as you see fit. As an FYI I've run extended intervals of 15K or so for all vehicles I've ever owned beyond warranty. I've never had an issue. Again, sorry to have to say this - but please spare me from any denigrating comments.