Okay, here is my update as of this morning...
Mileage: 5783 miles
% Oil life remaining: 45% (= 12,851 total mileage at 0%)
Days since last change: 110 days of ownership so far without an oil change
Driving behavior: 15 min x 2 for weekday (city driving) commute -- my city commute is 45-55 mph as I live in a south suburb of St. Paul with posted speed limits of 45-55mph depending on the road I am on
Besides the daily commute, I weekly get in about 80-150 miles of interstate driving.
In this first 5783 miles, I can state that I have done a lot of remote start warm ups, sometimes for the full 15 minute timeout period. I have also done some long idling warm ups, especially when I was parked outside in the elements at -14F.
One other thing I focus on, although should not impact oil life (?), is that I try to plan my usage so that when DPF Filter % Full is approaching a regen cycle I try to be on one of my longer highway runs and I let the regen complete all the way down to 0% Full before I think about parking and shutting down the truck.
I also have been using 16 oz. of Power Service white additive to every fuel up since taking ownership --> https://powerservice.com/psp_product...-cetane-boost/
. I can't see how this would impact oil life, but just wanted to let everyone know how I have been operating my truck.
I have noticed that my short daily commute is not long enough for the truck to get up to full operating temps (FORScan mod to Show Temps Above Gauges), and that to get the best fuel economy out of the truck it seems happiest to do so when it is fully warmed up. I have also noticed the best fuel economy happens with the cruise control set at 50mph (tranny in 10th gear).
I am planning to do my first oil change at 7,500 miles now, and probably change every 7,500 miles. When the snow and ice melts down up here I will be towing my boat around a lot for fishing and expect doing so will shorten down my oil life. So far I have not done any towing, which some of you may be doing already causing shortened oil life. I am likely going to have the 26 gallon OEM fuel tank swapped out for the 48 gallon Titan tank (https://www.dieself150forum.com/foru...fuel-tank.html
) at the same time I go in for my first oil change which should be mid-April at the rate I have been going.