Had some issues with the oil filter housing for my GM truck, thought I'd bounce this off of the best The housing is GM for a remote GM oil cooler in , it's been peeing oil for a while, kind of feel like the Exxon Valdez. Anyway, the reseal kit came with a flat gasket ( as well as the O ring ) that goes between the block and the aluminum adapter housing. I can't recall ever having to put a gasket between the oil filter adapter and the block on a non-remote setup ..anybody know why that gasket is there? I would think all of the oil sealing occurs with the O-ring ?? Anybody ever replace this on their GM truck..it's been a pain in the butt, what I thought would be a simple job..Haa!