Today, I decided to put some fresh oil in the engine for Carlisle weekend as sludge is still working its way loose from years of neglect. When I pulled out the oil filter, I stuck my finger down in the canister and felt probably a good inch of sludge in the bottom. So, I disconnected the inlet and outlet lines, removed the canister and cleaned it out. The worst of what was in the bottom was like Play Doh when it's just about hard. I scooped that out with a worn screwdriver and wiped it out thoroughly. I reassembled everything and decided to go for a short drive. Almost as soon as I left the driveway, the filter cover gasket let go and there's about 2 quarts of fresh 10w-30 making a stripe on the street. I took the canister off the engine again and also removed the drain line and cleared that with brake cleaner. I put it all back together with an NOS USA-made Hastings filter instead of the made-in-Turkey Fram and it all seems fine now. What a mess.