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Exactly the plan. I’ve ALWAYS run Rotella T4 15-40. My lml was healthy and strong as an ox at 205k. No usage, no smoke, clean (relative to other diesel) oil every change (after being deleted at 100k), but the internet has convinced me to try Motocraft in this thing with all the different...

That’s interesting. I actually didn’t really even pick up on that since I was trying to figure out the viscosity, combined with everything else based on the assumption the dealer actually put 10-30 in. Update: Changed oil, took 13.5 qts out. Which works out to about 3.8% dilution? Quick math...

Sample was taken hot, from the drain plug cracked open, after a full temp cycle as soon as I got home.

I’ve read the forums for a while. My oil reports have always been fine on my old truck. I was fairly familiar with my LML. This is the first OA I’ve done on a Powerstroke, and first OA on an emissions intact vehicle. I’m a little puzzled. I did not do the last oil change, the paperwork supplied...