After I stopped only 200 miles into my trip to Reno for gas, I saw a pool of oil under the truck from the rear main and other seals. It was more oil than I've ever lost from a six-cylinder just getting gas. I ordered a full seal kit from Fel-Pro, and tossed some Royal Purple oil and filters in the truck. I tend to get full seal kits with every new pile purchase. Cappa and Hazel talked me out of doing the rear main and oil pan for now. But I've replaced the valve cover, oil filter adapter, throttle body, and thermostat housing gaskets.