I have used both Hylomar and an RTV type silicone, preferring the later. In this case > Wurth Super RTV Silicone as my choice sealent. My preferred gasket is the competition gasket http://www.burtonpower.com/competition-sump-gasket-set-ford-x-flow-ohv-kent-711m-bda-fp713kc.html Don't over torque the sump bolts. Any deformity of the pan will lead to a leak. The last time i had the pan off i ended out with a small weep. Thinking it was the fwd banana seal i did it all over again only to find out it was the crankshaft seal. Nice easy fix, just a shame i didn't notice the thing leaking in the first place.....Doh !