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2000 Subaru Forester, 170K miles, 5 speed straight drive

Engine misfired the other day, flashing CEL. I changed the plugs and wires today just in case and plugs from cylinders 3 & 4 (rear cylinders) were coated in burned oil. Plugs 1 & 2 were oily, but less so.

What does burned oil on the plugs indicate?
 
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