Well, my truck is behaving properly when it comes to oil change intervals.
My first oil change was at 8,172 miles, and when I did that change I was tracking to 0% oil life remaining at 10,xxx miles. This first oil change I did with Rotella T6 5W-40 since 5W-40 is what is recommended when running biodiesel that the fuel stations in Minnesota are mandated to sell us 5-20% biodiesel.
I have 1,721 miles since putting in Rotella T6, currently have 82% oil life remaining, so at this moment I am tracking to 9,561 miles before 0% on this oil change. The reason I am not tracking to 10K on this oil change is that I about 10% of the miles on this oil are fiberglass boat towing miles.
I am planning to change oil going forward at 7,500 mile change intervals, or when my oil life remaining is 20%, whichever comes sooner. I know that when I get heavy into fishing season this summer that all the boat towing may end up having me changing oil in the 5,000-7,500 mile range.
There is another thread that was previously opened up on this oil change interval subject, so anyone tracking this thread may want to get caught up by reading all the posts in that other thread, with link to that provided below. From the research I and others have done, the biggest impact to oil life is driving conditions--extreme/severe driving conditions, long idle hours (as one may accumulate with 70% city driving), etc. The original thread on this topic started by
will provide more considerations -->