I have a 2000 S70 turbo with 115000 miles. I replaced the spark plugs with new Volvo plugs when i had a problem with Cylinder 3 misfiring. When removing plug 5, i noticed oil on the old plug when i pulled it out. Oil covered the electrode portion of the plug so it seems that oil is leaking into the combustion chamber. I am interested in knowing if anyone has seen this before and what may have caused this issue. Plug 4 was covered in oil as well. Plugs 1-3 were dry as a bone. I haven't noticed any smoke coming out of the exhaust so i am not sure if it is burning a significant amount of oil. If anyone can help with a solution and explanation of my issue it would be most helpful. THanks

Bobby

2000 Volvo S70 115000 miles.

 

Was there oil on the top?
Is so it might have leaked by the coils into the spark plug well. If it was dry up top then the o-ring that seals the spark plug well between the cam cover and the head might be bad.

 

It was dry up top. How difficult is it to replace that o-ring? do you know where i can find a diagram of the replacement process?

 

It is a pain and you need special tools.
How much do you really want to get into it?