shor,

I had to do a little research to figure out what truck and engine you have..it probably wouldn't hurt to update your profile with current info.

With either a spin on or a cartridge in a can, there is a nice soft gasket that should seal against almost surface. Sometimes the old gasket gets left in the groove (canister) and that can cause leaks.

If the sealing surface is so eroded that a leak free connection can't be made, maybe you could sand it to a bright clean surface and coat it with some Devcon or similar epoxy. After it was dry you could sand it flat and smooth to regain your sealing surface.

I would make sure I had the proper filter first and that it was sealing against a clean surface. It would seem to me that big old fat gasket that comes with oil filters would seal well against almost anything. Is this really where it is leaking?

Stuart