Terry: "dealer said not to bring it back unless its throwing codes or rods." I've had similar reaction from dealers on my EB3.5. 2 ways to interpret:
1) it's all in our heads (no pun intended). The motor will keep on keepin on despite what our oil analyses and stethoscopes say (actually, I don't have a stethoscope).
2) the dealer WANTS the engine to fail, preferably at 61,000. Regardless of when, a pound of cure is worth way more to them than an ounce of prevention.
I've now developed the attitude (in addition to not trusting dealers) that Pennzoil is bad oil for EcoBoosts with fuel dilution. I have 4-5%, based on 2 Amsoil/Polaris UOAs, with certain other "warning signs." The last PDS's I saw had Platinum & Ultra Plat 100 C viscosity in low 10's, but VOA's show them to be in low to mid 9's (new!). UOA's have it dipping into the mid-to-low 8's. Including mine: 8.2 (after 6k), and now 8.4 after only 900 miles. Maybe this doesn't matter, and lubricity and other protections are outstanding. But before I go on my summer trip, I'm putting something much thicker in. And QSUD viscosity, while it starts out high, doesn't end high in the Ford UOAs I saw. So it makes you wonder if any Shell products can stand up to the Ecoboost torture chamber. Rotella MV or GT might. Of course, I wish the dealer would help find the Root cause of the fuel diluting, but if no codes, no problem in their minds. Who is Polaris to tell them they have a problem. So off I go to add 7-8000 miles of torture to the engine with the root cause undiagnosed.
Some will say you need a long UOA trend, but IMHO, a "trend" of 2 bad data points is cause enough to change something. That said, I don't see how the oil causes the fuel dilution, but evidently some can't handle it without breaking way down. It probably needs to be either Rotella or go out of spec (0w40, 5w40) and hope there is no warranty disqualification. I'm not sure what the virgin viscosity of the latest Magnatec is. I did see a Castrol Edge UOA in a EB that did not impress me, and even std 5w30 M1 didn't pass with flying colors.
Reading your comments, you know more than I ever will, and have mechanical capabilities beyond mine, so I realize I have to offer my $0.02 at a 100% discount. But from what I've seen, my engine won't make it to 150k unless I take some corrective action.