Hello Patrick,
The rear crankshaft seal was leaking on my 411 S5 and I was told the engine needed to come out to replace it.
Unfortunately once the engine was out I conceded that we should inspect the bottom end. One thing led another and the most expensive automotive project in my life. But that's another story!
Cheers,
Kevin
PS. From memory it is a rope type seal on the 383/400 CID engines used in the 411.
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