It will assume you used an OEM approved oil … if you didn’t that’s not the OEM’s problem nor something they should waste resources on …
(you know all this 4wd but other in the thread may not)
This is correct - the OLM is based on the rated oil. If you dont run at least that well, then thats your problem.
A higher spec oil would simply leave more buffer.
As our own Dave Newton and others have expounded a very small % of users actually ever see an ROI using any oil analysis. Other than the entertainment factor its almost always a waste of money on passenger vehicles - just spend the money on an oil change.
My last use was to help determine a condemnation hour point for a diesel generator used every day, and the knowledge gained showed that-
1. the manufacturers recommended interval could comfortably be doubled saving me a ton of time and money here. I could go from 150 -300 with no sweat.
2. "cheap" off the shelf 0w-40 did an excellent job in the little diesel making allowing me to avoid a specific "diesel HDEO" oil and affirming I could use my bulk stash of it for other engines safely at these intervals with confidence.
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