Your right, this must be a common problem because I just changed my oil yesterday and notice the oil (not ATF) leaking from the exact same place (between the engine and trans). I also noticed oil leaking form around the bottom of the distributor.

Does any body know how hard it is to replace a rear main seal?
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Wrecked 2003 Dodge Neon with only 3k miles $4600, Repairs $2500, Total $7100. Trading it for a 98 prelude with 91k miles Priceless!