Thanks for the heads-up Ah-Kay. Any recommendations on a fix? Is there a sealant that can be applied to the groove in the "grommet" to give it a better seal?

I presently have a rubber one on there purchased from O'Reiley. It leaks oil across the top and into the oil cap area...

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1988 300 TE - Schnitzel (Daily Driver)
1995 E300 - Betty (Son's Daily Driver)

1987 300 TD - Kraut (Dropped a valve)

1987 300 D - Hans (Need to rebuild engine)