How to fix oil on the spark plug?

This is actually a pretty serious problem it means the piston rings that keep the oil from entering the combustion chambers are failing and you end up getting oil in your air fuel mixture and burning some of it.

If the oil is on the top of the plug, you have a failed valve cover gasket. If it is on

the bottom, you have internal engine problems.

I have seen people put chain saw plugs in the oil fouled cylinders and it worked!

don't know what the long term effect is $#!+...?