BXA/BSM spark plug tube seal issues

Quick question to senior S6 and S8 drivers. Has anyone experienced in their journey that the spark plug tube seals were leaking? I’m planning on fully rebuilding my engine (bore and hone it with metal sleeves) and I’m curious whether some of you have ever seen them failing and causing issues.

This thread may be a useful reference


If you are replacing all the seals, the issue with oil leaking into the spark plug tubes will be addressed.

Thank you! I admire the work you’ve put into your rebuild! I hope I can start with mine in August! Did your cylinder walls start losing their coating too?