Both my 300D's usually get a little oil on the underside like yours, despite my best efforts. It isn't enough to leave noticeable drips where I park and no significant oil usage, nor does it hit the exhaust pipe for that "burning rubber" smell (currently our 2002 minivan), so I consider it basically an advantage in keeping the underside from rusting.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans