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If it were a shorter time after your last change I would have guessed it was 'drained oil' that collected up on the horizontal metal panel near the drain hole...any change that is not fastidious will provide for oil collecting there, and dripping for a few days.
Doubt it's that after so much time, but maybe a slow drip/weeping drain plug bolt?
And, if you don't have ramps or a lift, it is possible to shimmy under there and take a look.
GL, mD
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