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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Changed bro-inlaws spark plugs. Cylinder 2 plug was oily?!



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      02-27-2012, 10:02 PM   #1
e92ben
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Changed bro-inlaws spark plugs. Cylinder 2 plug was oily?!

Brother in law has a 09 e92 m sport 335i x-drive. He's at 60k and asked if I'd help him change his plugs. All were we'll except cylinder 2 had oil on the plug. Any thoughts? I was leaning towards leaky injector...
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      02-28-2012, 12:00 AM   #2
boostd92
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? How would a leaking injector get oil on the plug... if anything, leaking gasoline would CLEAN oil off the plug.

He probably has a bad valve cover gasket... or at the very least, the circular rings in the center of the valve cover gasket.
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      02-28-2012, 12:01 AM   #3
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Originally Posted by boostd92 View Post
? How would a leaking injector get oil on the plug... if anything, leaking gasoline would CLEAN oil off the plug.

He probably has a bad valve cover gasket... or at the very least, the circular rings in the center of the valve cover gasket.
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That would be my guess too.
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      02-28-2012, 12:57 AM   #4
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If it was cylinder 2, it's right below the oil cap. Possibly a spill during an oil service or a top off can cause it. Just clean it out and keep an eye on it.
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      02-28-2012, 08:43 AM   #5
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Was the oil on the tip of the plug in the combustion chamber or was it on the top/exterior portion of the plug?
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