Car Problem Reports

Subaru Forester Worn Out Gaskets Allowed Oil to Seep Into Spark Plugs

Subaru Forester Problem
23 Reports
Me Too

Model Years Affected: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010

Engine Affected: 2.5L 4 Cylinder

Average Mileage: 97,544 mi (51,000 mi - 160,000 mi)


An oil leak can develop from the spark plug tube seals. Excess oil in the spark plug tubes can result in engine misfires and illumination of the Check Engine Light. Our technicians tell us that removing the valve cover and replacing the tube seals and cover gasket is necessary to correct this concern. Oil damaged spark plugs, ignition wires, and ignition coils will also require replacement.

  • Visitor, , 80,000 mi

    Oil leaked into spark plug tubes. Destroyed coil and wires. Replaced all.

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  •  Enthusiast

    Worn out spark plug tube gasket and or valve cover gasket allowed oil to seep into spark plugs, which damages the spark plug wires. Needed to replace the spark plugs, wires, & gaskets.

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  • Visitor, , 2.5L 4 Cylinder, 72,000 mi

    Spark plug wires and rubber boots covered in oil. Diagnosis was that engine needed new cover seals. Not resolved yet.

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  • Visitor, , 2.5L 4 Cylinder, 63,000 mi

    Pulled the boots to change the plugs and discovered oil all over them. New seals are on order now, looks like I've got another weekend project. I don't mind maintaining my vehicles but this is ridiculous! Why would Subaru allow for something like this to go on for so long???

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  • Visitor, , 2.5L 4 Cylinder, 104,800 mi

    Check engine light began flashing and then shutting off - system code was for a misfire in cylinder two. Spark plugs and wires were covered in oil, replaced seals, plugs, wires and ignition coil. So far, so good.

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  • Visitor, , 2.5L 4 Cylinder, 87,000 mi

    Brought car in for oil change and tune-up. When they pulled out the spark plug to change it, found oil leaking. Garage was able to change spark plug and wires, but they said I need to have both head gaskets replaced sooner than latter. They quoted me about 650-700 for the job, it's 5 hours of labor they said. Does anyone know if this a decent price?

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  • Visitor, , 2.5L 4 Cylinder, 160,000 mi

    This is the need to fix

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  • Visitor, , 2.5L 4 Cylinder, 55,000 mi

    Oil Leaked into Spark Plug Tubes causing misfire on Cyl 3,4. This was repaired then CC showed bad. After replacement of CC under warranty misfire problem is back. Dealer replacing Coil Pack (not under warranty).

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  • Visitor, , 2.5L 4 Cylinder, 59,000 mi

    Noticed gas mileage declining. Thought the spark plugs might need changed, getting close to the time for it anyway. I wanted to check the plugs but found oil in the plug wells. I put it back together and I am persuing factory warranty replacement for all seals that could be contributing to the problem. Not sure if this will be covered but it seems like it should be part of the 60k powertrain warranty.

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  • Visitor, , 2.5L 4 Cylinder, 155,000 mi

    Oil was leaking int spark plugs....eventually caused misfire (flasning check engine light) Replaced seals/gaskets, plugs, and wires.

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