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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 02-04-2013, 07:56 PM   #1
p.mcconnell
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Join Date: Nov 2011
Location: Alameda, CA
Posts: 7
My Ride: 2003 M3
Blowing oil from the filler cap

Hello All,

My 2004 M3 had oil leaking around the filler cap. I know this can happen so I replaced the filler cap. Now I still have oil leaking around the filler cap. Quite a bit in fact. Like about a liter every 200 miles. That stuff is expensive and you don't look cool when your ride stinks of burning oil and has smoke coming up around the hood.

So, did I just get a bad cap, or is there some other malfunction that might force oil out around the cap gasket? I'm stumped.

Thanks!
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Old 02-04-2013, 08:08 PM   #2
BMWCaptain
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Join Date: Sep 2011
Location: TEXAS - Where I give Real World advice and don't just criticize others. People here need to RESPECT other's opinions!
Posts: 1,601
My Ride: 03 325iT SportWagon
Look for other problems like a bad CVV or a vacuum leak. Also check your intake boots for cracks.
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Old 02-04-2013, 08:22 PM   #3
p.mcconnell
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Location: Alameda, CA
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I'm not sure what the CVV is. I will look for vacuum leaks and inspect the intake boots.

Thank you.
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Old 02-04-2013, 08:38 PM   #4
lsbmatt
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Location: bay area
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My Ride: 2002 vert m3 lsb smg
Quote:
Originally Posted by p.mcconnell View Post
Hello All,

My 2004 M3 had oil leaking around the filler cap. I know this can happen so I replaced the filler cap. Now I still have oil leaking around the filler cap. Quite a bit in fact. Like about a liter every 200 miles. That stuff is expensive and you don't look cool when your ride stinks of burning oil and has smoke coming up around the hood.

So, did I just get a bad cap, or is there some other malfunction that might force oil out around the cap gasket? I'm stumped.

Thanks!
I had the same issue with my new aluminum oil cap, all I did was take it off, put it back on slowly and looked at it at eye level while doing so - - and twisted it slowly till it was tight, then took it off and did it again and carefully/slowly at eye level tightened it till firm. no more oil leak. Even when I got my car back from an oil change, same thing happened - - I did the above and no more oil leak. Slapping it on and twisting it won't work with these aftermarket caps, you have to be precise.

Last edited by lsbmatt; 02-04-2013 at 08:40 PM.
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Old 02-04-2013, 08:40 PM   #5
BMWCaptain
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Join Date: Sep 2011
Location: TEXAS - Where I give Real World advice and don't just criticize others. People here need to RESPECT other's opinions!
Posts: 1,601
My Ride: 03 325iT SportWagon
The CVV is the crankcase ventilation valve, BMWs version of a pcv valve. It is located under you intake and can cause oil problems with the engine if it gets clogged or frozen.
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