Technical Stupid Question - what oil pan plug gasket?

I've got a drippy drain plug in the oil pan on my flathead Ford. It's the smaller plug, not the 1.5"ish kind. I've tried fiber gaskets, and now have a teflon type gasket. They all drip. The plug itself is a newer repro, and threads in just fine.

(I'm ready for all the comments about all flatheads leaking)

Do any of you mechanical whizzes have a favorite plug gasket that doesn't leak too much?

 

Next time you change oil inspect the pan where the plug goes. It may be chewed from where Elmer down at the filling station over tightened the plug to get it to stop leaking with no gasket, some time between 1955 and 1962.

You can smooth it out with a disc grinder. I use a nylon or copper gasket, whichever the parts store has. Replace every 4 or 5 oil changes, never have a leak.

 

i recently had one that would not stop leaking. i tried a fiber, then a teflon gasket. turned out there was a crack at the spot weld that held the bung to the inside of the pan. give that a good look.
i have never found one type gasket to be better than others.

 

Solid copper washer ...

 

Third Generation Automotive in TN has br*** ones that work.(thirdgenauto@gmail.com)

 

I would try slipping an o-ring over the threads on the plug.

 

^^^THIS^^^
having said that, i did have to dress the face of the pan where the washer mated on one car i had years ago to get it to stop leaving one drip on my floor sitting overnight..

 

^^^X3^^^

 

The tip about the crack is a good one. Also if the pan is bent and pounded to oblivion it won't help but you would have noticed that wouldn't you?

 

If the plug is new and the gasket is new and it leaks, it's time to put the oil pan fitting in the line up of most likely suspects.

 

Lotta new cars have thick alloy sump plug washers these days, seem to seal up pretty good as well..