its the main seal. the car sat for over 5 years with out being driven and only started leaking after being driven for little over 300 miles. the leak gets bigger over time and only comes from the back of the engine, not from the value cover.

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84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800