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Fouled plugs usually have a black tar-like substance on the electrodes, not liquid oil on the threads.
Since the plugs go (more or less) straight downward into the chambers, it is unlikely for any decent amount of liquid oil to stay on them. It is much more likely that there is some liquid oil getting into the bottom of the spark plug bores past the lower seal. Then when the plug is removed, that oil wicks onto the plug threads.
My CRX has a similar problem, but more severe. The end of the plastic connector on the plug wire is wet with oil, and there is a noticeable amount on the hex-shaped part of the plug itself. And the threads.
-soD
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