Anyone run it year round? I am stuck between switching from it to 5w40 or staying with it for the summer. I read that the 30 weight doesn’t break down but the 40 weight can break down to below a 30. My Truck is not a hard worker. I do want to keep the 10W30 because the truck seemed to like it a lot better than the 15W40. I switched to it in the fall. Any advice?? Thanks.