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Oil leaks from the rear of the engine are usually caused by old expansion plugs. This video describes and walks you through the replacement process. Good luck and don't hesitate to ask me for help if you have any questions.
A000 998 55 90- 2 small expansion plugs
A000 998 56 90- 1 large expansion plug (engines without vacuum pump)
No sealer should be used in the installation of the new plugs.