I tried repair goup and exhaust tape type materials and all failed. My solution that worked was to braze the O2 onto the bung on mine because I needed to keep the O2 in there and that was my only option at the time. No braze rod in our shop at the time so I used Coat Hanger(a wire one), still holding up and no leaks for the last 9 months!

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....