The truck was indeed leaking before I took it to the shop. I had a small manifold leak that I "lived with" for over a year. Recently it started leaking heavily from the opposite side and at that point I had to have the intake resealed. The shop did a great job on the manifold - I don't believe their work and anything to do with the additional component failures. After replacing the radiator, waterpump and cap the truck is again leak free. Getting the fan nut off was a real bear - I ended up chaining one of the pulley bolts to the frame cross member. I had the shop put mobile1 back in the truck after the intake job and will stay with synthetic going forward.