So I did a tune up today. Replaced spark plugs and coils with all OEM parts. I noticed the spark plugs I was removing was caked in what seemed to be oil. But when I smelt the oil it smelt nothing like motor oil. Any ideas? I have a VTA catch can by BSH installed. Maybe some blow by is finding its way back into the valve cover via the valve cover ventilation hose connected to my catch can. Here is a picture of a spark plug.