7796 mi. on oil, for 1 year, (86,336 on Truck) 4.6 engine, and filter change, Amsoil SDF 11at 3500 miles, 1 qt. top off. Started with syn. at 52k miles, before that it was Motorcraft 5W-30 and Motorcraft filters every 3k miles. This is my first UOA, Blackstone. Only driving the truck on weekends...