The 16V engine has the plugs in holes in the center of the valve cover.
The 12V engine has the spark plugs in the front side of the head.
Since the oil is only on the threads, you should look for external sources
of oil such as the valve cover gasket. On the 16V engine, this could soak
the wire boot and contribute to a misfire. If you have no oil damage to
the wires, you should probably proceed with the first steps of otherwise
normal misfire diagnosis (checking plugs, wires, coil). Since you have
P0302, concentrate primarily on the components of the #2 cylinder. If you
don't find anything conclusive, you can try switching plugs, wires (if
they'll reach), or coils with another cylinder to see if the misfire moves
to the other cylinder.
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