If you struggle to find the source, you could try throwing some UV dye in the crank case, then checking before it gets everywhere so you can trace the source.
Obviously, you would want to try to identify the kind of oil it is before adding dye.
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'97 - Silver (rebuilt/stripping)
'99 - Black (rebuilt/sold)
'01 S - Rainforest Green (daily)
'03 S - Orient Red (sold)
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