You got oil leaked down the plug holes from the valve cover you will need to buy a tube of ultra grey silicon . try this take all plugs out wash them with carb spray wash the spark plug holes out with rag twisted onto screw driver and gas ect ok when dry put a little smear of the ultra grey onto the spark plug threads near the center of the threads all the way around then screw plug into hole let it dry do all the plugs this way it should top the miss if it come back and theres more oil in the spark plug tube hole youl have to take the valve cover off and clean the gasket with gasoline or carb spray dry the gasket off then clean gasket groove on pan and dry it with rag (tee shirt) put a smear of the ultra grey silicon (get at autozone ) all the way around the gasket both sides wash the head where the gasket go's (seals)with gas or carb spray (also nail polish remover ) put valve cover on see that the gasket is in place proper befor tightening the cover bolts
SOURCE: eng. shakes spits/sputters oil in spark plugs
I just had this fixed on my suby today. The cause is that the spark plugs, go through the valve covers on the 2.5 l .When the o rings in the cover go, the result is oil in the spark plugs. The cost of the repair in Canada was about $500 including diagnostics as well as new plugs and wires About 1.5 hours labor and new seals and gaskets. It now runs like new. This is a common problem for this subaru engine as well as for the dodge neon.
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