oil in spark plugs
oil... 
It's your spark plug tube seals. There are two sets, 4 upper seals between the valve cover and rocker arm assembly (Yellow). Then another 4 lower O-rings between the rocker assembly and the cylinder head (Red).

If you buy a valve cover gasket kit it should have all of the appropriate gaskets and O-Rings.

It's your spark plug tube seals. There are two sets, 4 upper seals between the valve cover and rocker arm assembly (Yellow). Then another 4 lower O-rings between the rocker assembly and the cylinder head (Red).

If you buy a valve cover gasket kit it should have all of the appropriate gaskets and O-Rings.
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