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4 Engine oil galley plugs and cam plugs can be big leakers. Oil galley plugs should get Permatex Form-A-Gasket #2, which is non-hardening and forever pliable. Cam plugs should get The Right Stuff, which works well in the toughest locations. We’ve seen seasoned engine builders use retaining screws and even J-B Weld to keep cam plugs secure and leak free.