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Old 07-07-2004, 06:56 AM   #1
rubberman
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Member#: 28881
Join Date: Nov 2002
Chapter/Region: South East
Location: Greenville, SC
Vehicle:
2005 LGT wagon
BSM Stage 2.5

Question Found oil on spark plug wires

Changed out the spark plug wires on my Outback with a new OEM set last night. When I pulled the old plug wires off each spark plug, I found oil puddled around the top edge of the hole going into the engine for the plugs. Every single cylinder had some oil pooled in the top. The spark plug boots held it in the top edge, so no oil was down in the tube where the plug is (checked this with a light). All the spark plugs are still torqued down tight, so nothing is coming from around them.

Does this indicate a seal problem of some sort in the motor? If so, should I be concerned?
I have always used Mobil1 5W-30 in this car.

The new plug wires have a small gap in the top sealing edge vs the stock ones - which means that if more oil puddles in there, it will drain down onto the spark plug.
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Old 07-07-2004, 05:29 PM   #2
EJ1
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I had the exact same problem with my 00 RS. Turns out the spark plug seals were bad. Went to Subaru, bought 4, installed them, and it's been great ever since. No leaks.
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Old 07-07-2004, 06:35 PM   #3
rubberman
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BSM Stage 2.5

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You are referring to new seals/washers on the spark plugs themselves or some other seal?

If you are referring to the spark plug seal/washer, seems like I would have seen oil all over the actual rubber boot that was located down over the sprak plug. That boot was completely clean, leading me to believe that there's some sort of issue with a seal out at the edge of the engine block where the recess starts for the spark plug access.
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Old 07-07-2004, 07:00 PM   #4
IMPREZALUVR
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Join Date: Jul 2004
Location: Coleman Texas
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1995 Impreza L Sedan
Aegean Blue Metallic

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aaaahhhhhhaaaaaa that could be the potential problem. We know there is an oil leak somewhere but never on the ground and can not find one anywhere. Thanx alot.
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Old 11-23-2004, 11:09 PM   #5
PeterJ
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2002 impreza RS

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I just changed my plugs and both drivers side boots had oil on them. The one closest to the firewall actually spilled about a teaspoon out when I removed the boot. Ive read in other posts that this might be a valve cover gasket leak; not soooo serious like a head gasket... subaruparts.com has the gaskets; now I have to read up on the engine manual.
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Old 10-23-2011, 10:00 PM   #6
octain11
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same thing happened with my legacy, oil on the plugs, but i read and saw on youtube that this was a common problem for subaru's and can be easily repaired
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Old 10-25-2011, 02:38 PM   #7
porcupine73
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2000 OBW
green

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Yes you just pop off the valve covers, and replace the spark plug tube seals. It isn't overly difficult. If there is too much oil in the spark plug tubes it can cause misfire. Normally I get the valve cover gasket set, which includes the bolt hole seals, spark plug tube seals, and valve cover gaskets. Some soob engines do not have the spark plug tubes penetrating the valve covers.
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