u/gorb-thingamabob

I have a 1997 Twingo with the D7F 8v engine. The studs for the exhaust manifold run through an oil passage (as I found out the hard way when one loosened up and fell out, dumping alot of oil onto the exhaust manifold and engulfing the car in a cloud of smoke).

I replaced the studs but noticed they're starting to weep oil again. Is there anything specific to be used on the stud threads to stop the oil from leaking out, and to stop the studs from backing out with vibration?

https://preview.redd.it/6q0b2gix7c2h1.png?width=729&format=png&auto=webp&s=b269e7e76d2408650f2a31ba87b52414e82712c1