Originally Posted By: BikeWhisperer
The trace fuel is not a surprise at all, pretty much the norm for Eco-Boost engines. I'm running a "thicker" 5w-30 Castrol for that reason (with a "thicker" Mobil 1 5w-30 for the next few oil changes)and once out of warranty will be running a 5w-40 (probably Rotella T-6). I've yet to see any proof that the fuel dilution contributes to wear though.
I put the same oil back in, but I may do a 5k change this time and move to something a little thicker that will resist what I assume is shearing.
My catch cat gets a lot of fuel/oil in it, so I'm assuming fuel dilution would be a much larger issue if I didn't have it. I am tuned pushing about 23 psi, so more boost must be creating a little more blow-by.