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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 05-25-2008
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Oil on spark-plug threads

I'm in the process of changing my plugs and noticed one of the plugs had oil on the threads when I pulled it. The truck doesn't burn any oil and runs like a champ. What could be the cause, and is it anything to be concerned about?

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Old 05-25-2008
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Doesn't make a lot of sense that there was oil on spark plugs and yet you're not burning any. Unless it's just so small that you haven't noticed yet. You sure it was oil and not maybe just carbon buildup?
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Old 05-25-2008
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any oil leaks from the valve covers?
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Old 05-25-2008
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Quote:
Originally Posted by KELLY88 View Post
Doesn't make a lot of sense that there was oil on spark plugs and yet you're not burning any. Unless it's just so small that you haven't noticed yet. You sure it was oil and not maybe just carbon buildup?
Well it doesn't burn any oil significant enough to notice on the dipstick between oil changes. I'm guessing it's a slight leak from the valve covers, I've been using Mobil 1 5w30 ever since the first oil change. Almost 90k on the truck now...
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Old 05-25-2008
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Doesn't oil leak down the valve stems and sit on the back side of the vavles in high milage engines?
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