Hi,
I hope you inset the RMS the proper distance. OEM is inset 11mm, but Porsche states to inset replacement seal 13mm to have the lip ride on a virgin, unblemished section of the Crankshaft. Failure to follow this could lead to early failure on the replacement. Don't remember if this is mentioned in the Bentley. Hope this helps...
Happy Motoring!... Jim'99
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