I used to drive 60 miles a day for work with an 04 Ranger 4.0L and run 10w30 M1. My new job for the last 6 months have been under 1 mile round trip and 0-25* outside. I'm using the same oil but I can tell its hurting it as the oil cap is alll white from condensation. Stick with the M1 or go to something else? Summer time is same trip, but I about max out my tow rating with the boat I have when we go to and from the lake.