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oil on spark plug thread

Discussion in '2nd Gen. Tacomas (2005-2015)' started by yamabiker, Mar 13, 2012.

  1. Mar 13, 2012 at 7:07 AM
    #1
    yamabiker

    yamabiker [OP] Well-Known Member

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    Changed out my plugs last night. I installed the last set 30k miles ago. All of the old ones looked pretty good. Dry etc. The plug on the driver's side, closest to the firewall (away from the oil fill spout) had a dry spark end which looked normal, no additional carbon etc. Yet, it had oil on the threads. No oil has leaked, dripped, been poured, etc. into the hole. I inspected the hole for the spark plug and there was no dirt or oil. So the oil must have come from the the cylinder? But the end of the plug was dry and not any different from the others. Anyone have any explanations. Something to worry about or no big deal? Engine sounds fine and runs fine. Mileage had been going down a bit. I was hoping new plugs would bring it back up.


    Thanks
    Yamabiker
     
  2. Mar 13, 2012 at 8:34 AM
    #2
    hawlisjawt

    hawlisjawt Well-Known Member

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    Is it oil or maybe anti-seize ?
     
  3. Mar 13, 2012 at 8:36 AM
    #3
    Lucario Runner

    Lucario Runner Resident SUV racer

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  4. Mar 13, 2012 at 9:58 AM
    #4
    Gincoma

    Gincoma Special Edition Member

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    Factory Monster Truck Package with reverse gear.
    It seems to be normal on the drivers side closest to the plug....your not the first one to notice that when people change there plugs...its happened to me first hand with my 05' and my 11' I installed my supercharger at 11,000 miles on my 11' and had same thing...oil on the plug so it seems to be a characteristic of the 4.0L
     
  5. Mar 13, 2012 at 7:14 PM
    #5
    yamabiker

    yamabiker [OP] Well-Known Member

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