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One oily spark plug

Impreza


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Old 02-26-2017, 08:48 PM
Vancouver98STi's Avatar
Vancouver98STi Vancouver98STi is offline
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Exclamation One oily spark plug

I pulled the spark plugs today... first time I've ever done this on a Subaru engine. Wasn't too bad with the battery and air filter box removed.

I suspect these NGK spark plugs (BKR6EIX-P) have been in this engine for a long time. Car has 140,000 km on it. I was a little disappointed to discover that the spark plug from cylinder #4 was rather oily. The sheen is noticeable on the ground electrode and on the nose of its ceramic insulator in the image below. I'm hoping this isn't an indication that major engine issues are imminent (or have already occurred).




I want to replace these with regular BKR6E spark plugs. I see that NGK has a slightly different version of this plug, BKR6EYA which is supposed to be "fouling resistant". I thought maybe this might be worthwhile to try keeping in mind that one cylinder seems to have an oil problem. Anyone have any thoughts on this? Any reason why using a "YA" plug (fouling resistant) would be a bad idea?

Last edited by Vancouver98STi : 02-26-2017 at 08:52 PM. Reason: Added question
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