For what it is worth, I have been running SuperTech 5w-30 Full Synthetic or High Milage Full Synthetic with a Motorcraft filter on my 2011 F-150 3.5 EcoBoost year round here in Anchorage Alaska. During the dead of winter our daily avg high is around 10 degrees F with a low around 0 degrees F. We can have cold snaps down to -35 degress F that last a few weeks or three. My F150 lives outside and doesn't have a block heater. Besides some slower cranking, which is more likely to be attributed to low battery voltage from cold temps, I have never had any issues. During the summer we move up to highs in the 70s/80s with lows at the 50/60s. I run the truck in excess of the Ford Algorithm. Typically I change it around "130 %" mark by resetting it back to 100% when the "oil life indicator" drops to 70%. I have to add 1 qt between changes. Each change is about 7500 miles. The truck currently is sitting just over 180K miles. The only major mechanical repair has been the transmission. Around 160k it was replaced.