Thanks EcoBOOST, for your UOA’s…from a fellow Ecoboost 3.5 owner. Something I’ve been pondering is just how much of the old oil do we get out during a drain on these engines, and therefore, how much does the previous oil affect the sampled oil’s results? Too bad the previous Valvoline didn't float your boat, as it appeared you didn’t have to resort to un-natural acts to get an oil that stayed in grade with it. I’m jealous of your copper results, and shouldn’t comment on your Silicon, though in my case, on a Transit van, the air filter box is a disaster design, prone to clamp breakage and poor seating/sealing. That said, you appear to know the source of your Silicon.
now, if I could get @bfleeman
to respond to my pvt message, since I think he also did some (Amsoil) 5w30 / 0w40 mixing….something I am strongly considering.
it sure would be nice if we could know or calculate the HTHS of these mixes.