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: 100,572 (19,000–237,000)
Engine affected: 2.5L 4 Cylinder
49 people reported this problem
31 people shared problem details
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.
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
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.
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.
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???
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).
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.
Replaced valve cover gasket, spark plug gaskets, wires and plugs. Good as new.
2006 Subaru Forester- 2.5L 4 Cylinder90,000Visitor
Same exact problem. Was told there was a leak in the gaskets and getting onto spark plugs. He said the spark plug looked fine and wouldn't need replacing. Well, a month later the check engine light comes on and it's the spark plug and coil spring that went out. Car drives horrible now.
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
2003 Subaru Forester80,000Visitor
Oil leaked into spark plug tubes. Destroyed coil and wires. Replaced all.
2005 Subaru Forester- 2.5L 4 Cylinder90,000Visitor
Oil in Spark plug tubes. One more than others. Cleaned them out a little and ran better. Will get the seals done.
2008 Subaru Forester- 2.5L 4 Cylinder67,000Visitor
Been having some minor engine misfiring and some buildup on the throttle body. Just discovered oil on spark plug wires. Likely valve cover gasket leak.
2009 Subaru Forester- 2.5L 4 Cylinder79,000Visitor
Went to change spark plugs and all sparkplug sleeves are leaking oil some more than others. Wiped down spark plug wires and installed new sparkplugs. Don't remember this with the 2002 Forester we had although I never changed plugs. Paid dealer outrageous amount for that service. Any idea what dealer would charge for the sparkplug tube gasket replacement?
2002 Subaru Forester- 2.5L 4 Cylinder169,000Visitor
car died when i looked at my spar plugs they where coverd in oil
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.
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.
2002 Subaru Forester- 2.5L 4 Cylinder50,000Visitor
Car is 12 years old but only has 80,000km on the clock. Townsville Australia.
Do I need special tools to replace the spark plugs? How do I get the wires off?
I detected a cylinder misfire..I have changed my spark plugs, the plugs wires looks okay to me...
th at oil temp is flashing i checked all the air hoses going to and from air box. all is fine....