As dcrusupa correctly said change the cam cover seals, No 5 & 6 plugs normally fill with oil due to the engine being slightly at an angle. May be worth using a set of stainless steel 6mm socket cap screws when refitting the cam covers back on. This will enable you to tighten the covers down a bit more but be careful not to over do it, the head is alloy.You said “gas and oil” how do you know its gas, I would of thought the gas would evaporate.
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