2017 F150 3.5 Ecoboost 6100 miles on 10W30 Castrol Magnatec 21,000 miles on truck, oil monitor was 39 % left with 630 total hrs and 99 idle hours with only a little towing on this oil. Went longer on this oil change due to a 1800 mile road trip. To recap, 1st is factory, 2nd is dealer bulk, 3rd is Penzoil Platnum 10W30, 4th Castrol Magatec 10W30 semi syn. Also send virgin sample of oil used in #4 change just to compare used vs new oil. Put 10W30 Magnatec back and will change early next time to get back on 5000 mile change at 25,000 miles.