First check that the oil is not from the top of the engine underneath the intake manifold. Not easy to see, i know, but not impossible either. Oil leaking head gaskets are not uncommon. If the oil is from within the bellhousing it can be the welch plug in the back of the main crank bearing oil channel (unlikely) or the crank seal (more likely) , either of which wil nesessitate the removal of the engine or transmission to gain access and replace. Big job either way. Let us know how it turns out.
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