LegacyUpNorth Posted June 20, 2017 Share Posted June 20, 2017 Took out the ignition coils and plugs to inspect after 70k km and found a little oil on the side of the boot (see pic). Looking down the plug hole (with spark plug still installed) it looks like a spark plug gasket seal wearing. So most likely a good time to do the valve cover gasket and plug seals. No biggie. When I took out the spark plug to inspect I found oil on the threads (see pic). Is this normal or am I looking at the beginning of head gasket failure? My vehicle has 160k km. I just did the timing belt, water pump, and tensioners last month. It's a 2011 2.5i CVT. oil changes done regularly using Amsoil and a Subaru oil filter. I check my oil regularly and no loss based on dipstick and I check the coolant reservoir regularly and I drop in coolant. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
GTEASER Posted June 20, 2017 Share Posted June 20, 2017 That oil on the threads is totally normal and from the leaking spark plug hole valve cover gaskets. This is pretty typical on a Subaru. GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
LegacyUpNorth Posted June 20, 2017 Author Share Posted June 20, 2017 Good to know. I plan on replacing them soon and just wanted to make sure it was normal. Any recommendations on brand of seals? Or just stick with Subaru? Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
FLlegacy Posted June 20, 2017 Share Posted June 20, 2017 Victor reinz makes a good gasket, but for the price oem is just as good if not better. Sent from my SAMSUNG-SM-G920A using Tapatalk Link to comment Share on other sites More sharing options...
Timothy.B Posted June 21, 2017 Share Posted June 21, 2017 My plugs had oil on the threads as well when I changed them last year. None on the plug boot or around the plug. I assume Subaru does this to prevent any kind of seizing of the plugs when removing them later down the road? Timothy.B's 2011 LEGACY 3.6R Link to comment Share on other sites More sharing options...
FLlegacy Posted June 22, 2017 Share Posted June 22, 2017 You should be reinstalling the plugs with anti-seize, this is a must with an aluminum head. Link to comment Share on other sites More sharing options...
LegacyUpNorth Posted June 22, 2017 Author Share Posted June 22, 2017 You should be reinstalling the plugs with anti-seize, this is a must with an aluminum head. Good point. I usually use anti-seize when doing the plugs. I plan to use anti-seize when I put in the new plugs. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
GTEASER Posted June 22, 2017 Share Posted June 22, 2017 And hose out the plug threads in the head with a little brakleen before you install the new ones. Just dont get too much in the cylinders, it will break down oil. Or do an oil change at the same time after the plugs are in. GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
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