I have a general question about newer spark plug locations, and how some cars have them now located "under" the valve cover..
I was comparing my wife's 4-cyl Mitsubishi vs our 6-cyl Jeep. The local shop said that the valve gasket was leaking on the Mitsu, and also the spark plug "tubes" were getting oil and fouling a plug - hence the "Service Engine" light.
So - when did this all change - I can't get a mental picture of how this all fits together..... "spark plug tubes" getting oil ?
tnx for any insight, photos, or diagrams you can point me at..