| I had this on my 7 which has the same engine as yours.
1. I changed the PCV valve at the rear of the engine
2. I had oil around the spark plugs, cleaned all this out, 2 new HT stubs, these engines all have this problem due to the slight Kant of the engine, the oil comes from the rocker cover gaskets, but mainly from the washers that hold the covers on.
Its been fine now for around 2 1/2 years.
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