I messed some of the threads up. Put new peice in but its still leaking slowly. I put some shellac gasket maker during reinstall. Indy I called said hes done 20 of those plugs and has cracked 3 blocks in the process because of how difficult it was to remove. He advised me to try more sealant.. pain of a job this plug is

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1994 e320 (Charcoal and grey) 140, 000 miles