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.
Engine Misfire Due to Oil in Spark Plug Tubes on Subaru Forester
Average mileage: 101,047 (19,000–237,000)
Engine affected: 2.5L 4 Cylinder
39 people reported this problem
25 people shared problem details
2007 Subaru Forester- 2.5L 4 Cylinder84,000Visitor
Oil is leaking into spark plug area. No legitimate explanation for this problem. It will be a necessary and expensive repair. I am very dissatisfied with Subaru. I will likely buy a Toyota next time.
2009 Subaru Forester- 2.5L 4 Cylinder55,000Visitor
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).
2008 Subaru Forester- 2.5L 4 Cylinder105,000Visitor
Same story. Seems to have been fixed in a satisfactory manner,but I've owned 4 Subarus, and every one of them had oil leaks from seals, gaskets etc. Last time ever buying one of these.
2000 Subaru Forester- 2.5L 4 Cylinder149,000Visitor
I have the same problem with my car misfire Check engine light and the car stalking intermittent
2008 Subaru Forester- 2.5L 4 Cylinder63,000Visitor
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???
2003 Subaru Forester80,000Visitor
Oil leaked into spark plug tubes. Destroyed coil and wires. Replaced all.
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.
2009 Subaru Forester- 2.5L 4 Cylinder95,000Visitor
Same problem as all of the other comments, oil in plug tubes. 5th Subaru and 1st time I've ever had a problem with one... considering the miles I drive, not too bad to "fix" a problem, but shocked Subaru didn't have a re-call on this...
2009 Subaru Forester- 2.5L 4 Cylinder63,000Visitor
For the 60,000 mile service my mechanic noticed the issue. New gasket, plug tubes, wires and plugs were necessary.
2007 Subaru Forester- 2.5L 4 Cylinder96,300Visitor
just replaced the spark plug tube gaskets. Do it yourself, take your time, save yourself $500 vs dealer.
Oil found in spark plugs when switching them. Changed valve cover gaskets and spark plug seals but now it runs rough.
2007 Subaru Forester- 2.5L 4 Cylinder132,000Visitor
Initially check engine light came on, I checked the code and got P0301 (cylinder 1 misfire) While replacing plugs I found oil had seeped into all the boots. I've replaced all the boots and will replace the gaskets next.
2001 Subaru Forester- 2.5L 4 Cylinder100,000Visitor
Oil leaking into spark plugs. Am inquiring about how to get new tube seals and cover gaskets
2002 Subaru Forester- 2.5L 4 Cylinder50,000Visitor
Car is 12 years old but only has 80,000km on the clock. Townsville Australia.
2002 Subaru Forester- 2.5L 4 Cylinder120,000Visitor
plugs arnt soaked in oill buy when i pull wire to change plug theres a small puddle of oil on top of ring
2006 Subaru Forester- 2.5L 4 Cylinder72,000Visitor
Spark plug wires and rubber boots covered in oil. Diagnosis was that engine needed new cover seals. Not resolved yet.
2008 Subaru Forester- 2.5L 4 Cylinder104,800Visitor
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.
2004 Subaru Forester- 2.5L 4 Cylinder160,000Visitor
This is the problem...now need to fix
2010 Subaru Forester- 2.5L 4 Cylinder59,000Visitor
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.
2002 Subaru Forester- 2.5L 4 Cylinder155,000Visitor
Oil was leaking int spark plugs....eventually caused misfire (flasning check engine light) Replaced seals/gaskets, plugs, and wires.
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