318 Rear Main Seal

One other thing I learned is that they say to nip off the wings, and rotate the seal about 3/8" of an inch so that in the cap it is sticking out a bit on one side and in a bit on another side. Do the same for in the block. Then reinstall the wings. Make sure to put RTV where there are any joints/seals. Easiest way to explain it is think of hardwood flooring, you never lay 2 pieces side by side with the joints beside each other, this is due to "weakening". Same goes for the seal if you dont rotate them, you have the seam from the seal as well as the seam from the cap to the block in exactly the same spot. Good luck!