CEL, P0307. Pulled the plug and looks like oil is on my sparkplug. What would cause oil to be on sparkplugs?

[PrestonJay12]

Wet testing compressions rise as you keep cranking the engine, to a certain point, because the oil in there is being thrown around. It also depends how much oil you put in the cylinder. I want to see if there is any difference, even if it is minimal and I still compare. We each know what works for each of us and gives us the info we are looking for.

Will crop pics next time. Thanks for all the advice everyone!