Do you think a particular oil prevents fuel dilution?I've mostly run M1EP 5w30 in our Ecoboost for 10k OCI's and it has performed perfectly. I did do one run on RGT 5w30 but I won't run anything but EP for more than a 5k OCI.
I also run Fram Ultras with that engine.
I've never smelled fuel in the oil like some Ecoboosts, so I think the EP is doing fine. I've not done a UOA on it. But I might at some point.