The dorman's doo look nice. I've been using these
GASKET ASST. LINKY And have taken to wrapping the plug threads with teflon tape
Shop on the suggested kits if you go that way as the price varies
Are we still talking spark plugs or have you shifted to oil plugs? Please tell me you don't teflon wrap spark plugs
Sure do, keeps them from making a good ground to the cylinder head and is great for comebacks, then i can upgrade the plug wires and other things
back to the drain plug, any chance you have a 12mm x 1.75 bolt n a 1/2x20 opening? I ask as they are close diameter and pitch wise, may mate and tighten but with little thread engagement. In over 50 years I have never encountered a drain plug that kept loosening.