Porsche 996 986 IMS kit
1997-2002 Dual bearing KIt $299
2002-2004 single bearing kit $299
IMS tool kit $160
AOS problem, oil in intake manifold.
1997-2002 dual bearing kit with IMS tool kit
2002-2005 Single bearing kit with IMS tool Kit
5 x stronger NSK Roller bearing.

Stronger center bolt 10 mm VS factory neck area 7 mm
believe to be the problem too.

To prevent oil leak
Dual O-ring cover plate for better fitment.
O-ring in the cover plate.

Porsche 996, 986 from 97-05  roller IMS bearing upgrade kit.