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  1. #1
    Active Member Two Rings
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    Feb 15 2018
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    414102
    Location
    Vancouver, WA

    Oil Leak 2009 audi 3.0t

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    Hello,

    I have an audi a6 3.0t and I have an oil leak that I have taken to the dealership like 3 different times now that they can't find.

    They even let the car sit for 2 hours idling and couldn't find a leak.

    This leads me to believe that the leak only occurs during high oil pressure conditions when I am driving it hard.

    It seems to be coming from the passenger side of the engine.

    Any ideas?

  2. #2
    Active Member Two Rings
    Join Date
    Feb 15 2018
    AZ Member #
    414102
    Location
    Vancouver, WA

    I thought it was the 1 time use oil drain plug, but I have replaced that and the leak still seems to exist.

  3. #3
    Active Member Two Rings
    Join Date
    Feb 15 2018
    AZ Member #
    414102
    Location
    Vancouver, WA

    Right now I contacted one of my neighbors who is a mechanic. We are going to get under the car tomorrow to look what's going on with our own eyes.

    I will update with pictures for you guys to review.

    I hope it is something minor - any ideas of what I should be looking for or any particular places that you guys want me to take pictures of?

  4. #4
    Veteran Member Four Rings SinCityA6's Avatar
    Join Date
    Jul 17 2011
    AZ Member #
    78357
    My Garage
    '07 Mustang GT Tungsten Grey/Black
    Location
    Sin City, USA

    Oil Leak 2009 audi 3.0t

    Common leaks are going to be valve cover gaskets, timing chain covers and vacuum pump. Best thing to do is to clean the engine as best you can, add dye to the oil (visible under black light) and run it for a week or 2. Then use the black light to see where it is coming from.


    Sent from my iPhone using Audizine
    '09 C6.5 A6
    M: 3.0t, GIAC/AWE Stg II+, Roc*Euro Intake
    I: Soul Black, CF Trim, LEDs, Paddles, C7 Shifter, Escort 9500i, Blackvue Dashcam
    E: Ibis White, 15% Tint, Smoked Corners, Tinted Tails, S4 Rockers, S6 Blades, RS6 Grill, OEM Splitters (F/R)
    S: H&R Springs/Sways, Koni FSDs, Adams Rotors, Akebono Pads, SS Brake Lines, Paint Matched Calipers, Niche Misano M116 Wheels

  5. #5
    Active Member Two Rings
    Join Date
    Feb 15 2018
    AZ Member #
    414102
    Location
    Vancouver, WA

    Quote Originally Posted by SinCityA6 View Post
    Common leaks are going to be valve cover gaskets, timing chain covers and vacuum pump. Best thing to do is to clean the engine as best you can, add dye to the oil (visible under black light) and run it for a week or 2. Then use the black light to see where it is coming from.


    Sent from my iPhone using Audizine
    Okay I will order some of that stuff, but it's leaking quite a good amount like .25 quarts to .5 quarts a day does this sound consistent with one of those leaks?

  6. #6
    Active Member Two Rings
    Join Date
    Feb 15 2018
    AZ Member #
    414102
    Location
    Vancouver, WA

    Do you have any recommendations for a safe dye to add to 5w-40 castrol?

  7. #7
    Active Member Two Rings
    Join Date
    Feb 15 2018
    AZ Member #
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    Location
    Vancouver, WA

    One of my friends took a look at it and he thinks it is the timing chain seal in the rear of the motor. Has anyone else had problems with this leak?

  8. #8
    Veteran Member Four Rings SinCityA6's Avatar
    Join Date
    Jul 17 2011
    AZ Member #
    78357
    My Garage
    '07 Mustang GT Tungsten Grey/Black
    Location
    Sin City, USA

    Are you seeing a lot of oil on the ground? That is an excessive leak. Something that large should be easy to spot!


    Sent from my iPhone using Audizine
    '09 C6.5 A6
    M: 3.0t, GIAC/AWE Stg II+, Roc*Euro Intake
    I: Soul Black, CF Trim, LEDs, Paddles, C7 Shifter, Escort 9500i, Blackvue Dashcam
    E: Ibis White, 15% Tint, Smoked Corners, Tinted Tails, S4 Rockers, S6 Blades, RS6 Grill, OEM Splitters (F/R)
    S: H&R Springs/Sways, Koni FSDs, Adams Rotors, Akebono Pads, SS Brake Lines, Paint Matched Calipers, Niche Misano M116 Wheels

  9. #9
    Veteran Member Four Rings SinCityA6's Avatar
    Join Date
    Jul 17 2011
    AZ Member #
    78357
    My Garage
    '07 Mustang GT Tungsten Grey/Black
    Location
    Sin City, USA

    Quote Originally Posted by NickLim View Post
    One of my friends took a look at it and he thinks it is the timing chain seal in the rear of the motor. Has anyone else had problems with this leak?
    These are common areas for leaking. There is no gasket on them. They use RTV sealant which breaks down and fails over time.


    Sent from my iPhone using Audizine
    '09 C6.5 A6
    M: 3.0t, GIAC/AWE Stg II+, Roc*Euro Intake
    I: Soul Black, CF Trim, LEDs, Paddles, C7 Shifter, Escort 9500i, Blackvue Dashcam
    E: Ibis White, 15% Tint, Smoked Corners, Tinted Tails, S4 Rockers, S6 Blades, RS6 Grill, OEM Splitters (F/R)
    S: H&R Springs/Sways, Koni FSDs, Adams Rotors, Akebono Pads, SS Brake Lines, Paint Matched Calipers, Niche Misano M116 Wheels

  10. #10
    Veteran Member Four Rings SinCityA6's Avatar
    Join Date
    Jul 17 2011
    AZ Member #
    78357
    My Garage
    '07 Mustang GT Tungsten Grey/Black
    Location
    Sin City, USA

    Quote Originally Posted by NickLim View Post
    Do you have any recommendations for a safe dye to add to 5w-40 castrol?
    Any oil dye should be fine. You are not adding enough to thin the oil to a point that it will cause damage. I wouldn’t run it for a prolonged period of time so you should change out your oil and filter once you determine the location of the leak.


    Sent from my iPhone using Audizine
    '09 C6.5 A6
    M: 3.0t, GIAC/AWE Stg II+, Roc*Euro Intake
    I: Soul Black, CF Trim, LEDs, Paddles, C7 Shifter, Escort 9500i, Blackvue Dashcam
    E: Ibis White, 15% Tint, Smoked Corners, Tinted Tails, S4 Rockers, S6 Blades, RS6 Grill, OEM Splitters (F/R)
    S: H&R Springs/Sways, Koni FSDs, Adams Rotors, Akebono Pads, SS Brake Lines, Paint Matched Calipers, Niche Misano M116 Wheels

  11. #11
    Active Member Two Rings
    Join Date
    Feb 15 2018
    AZ Member #
    414102
    Location
    Vancouver, WA

    Quote Originally Posted by SinCityA6 View Post
    These are common areas for leaking. There is no gasket on them. They use RTV sealant which breaks down and fails over time.


    Sent from my iPhone using Audizine
    What is the repair like for a timing chain seal on this engine then if there is no gasket?

    As in what needs to be done?

    Thank you for the very informative information btw!

    - - - Updated - - -

    Quote Originally Posted by SinCityA6 View Post
    Are you seeing a lot of oil on the ground? That is an excessive leak. Something that large should be easy to spot!


    Sent from my iPhone using Audizine
    Ehh not that much, I exaggerated a little bit, but there is definitely a pretty good drip every time I park

    - - - Updated - - -

    Leak size seems proportional to my driving aggression, which makes sense if its a faulty seal - the oil only seeps through under high oil pressure conditions and in proportion to the oil pressure
    Last edited by NickLim; 02-15-2018 at 10:24 PM.

  12. #12
    Active Member Two Rings
    Join Date
    Feb 15 2018
    AZ Member #
    414102
    Location
    Vancouver, WA

    Also; would there be anyway to verify the speculation and if this job is being performed is there any other things that should be done?

  13. #13
    Active Member Two Rings
    Join Date
    Feb 15 2018
    AZ Member #
    414102
    Location
    Vancouver, WA

    There is no concern for this as long as I keep the oil topped off right? So I guess the best thing would be to run it like this for a week with the dye and keep topping it off and then go in and fix up all of the seals.....


    Really frustrating that something like that would be designed to degrade over time

  14. #14
    Veteran Member Three Rings ichi d's Avatar
    Join Date
    May 10 2013
    AZ Member #
    114947
    Location
    T.O.

    check the rear main seal. the dealer had to add dye to find it on my car. if you cant see any visible leak from the hood and you cant see it leaking from the time chain covers, chances are its most likely the rear main seal.

  15. #15
    Veteran Member Four Rings SinCityA6's Avatar
    Join Date
    Jul 17 2011
    AZ Member #
    78357
    My Garage
    '07 Mustang GT Tungsten Grey/Black
    Location
    Sin City, USA

    Oil Leak 2009 audi 3.0t

    Quote Originally Posted by NickLim View Post
    What is the repair like for a timing chain seal on this engine then if there is no gasket?

    As in what needs to be done?

    Thank you for the very informative information btw!

    - - - Updated - - -



    Ehh not that much, I exaggerated a little bit, but there is definitely a pretty good drip every time I park

    - - - Updated - - -

    Leak size seems proportional to my driving aggression, which makes sense if its a faulty seal - the oil only seeps through under high oil pressure conditions and in proportion to the oil pressure
    Quote Originally Posted by NickLim View Post
    Also; would there be anyway to verify the speculation and if this job is being performed is there any other things that should be done?
    Quote Originally Posted by NickLim View Post
    There is no concern for this as long as I keep the oil topped off right? So I guess the best thing would be to run it like this for a week with the dye and keep topping it off and then go in and fix up all of the seals.....


    Really frustrating that something like that would be designed to degrade over time
    The timing chain covers can be removed relatively easily. As I stated before, there are no gaskets between the cover and the block so you will need to clean both surfaces of any existing sealer. Make absolutely sure that none of the sealer falls into the timing chain area when cleaning. Once both surfaces are clean, use good quality RTV sealer and make a nice bead on the covers and reattach.

    As long as you keep the oil level within spec, there will no no issue running it for a short period of time with the dye to get a good idea of where the leak is coming from. Once you determine where the leak is coming from, fix it and then change the oil.



    Sent from my iPhone using Audizine
    '09 C6.5 A6
    M: 3.0t, GIAC/AWE Stg II+, Roc*Euro Intake
    I: Soul Black, CF Trim, LEDs, Paddles, C7 Shifter, Escort 9500i, Blackvue Dashcam
    E: Ibis White, 15% Tint, Smoked Corners, Tinted Tails, S4 Rockers, S6 Blades, RS6 Grill, OEM Splitters (F/R)
    S: H&R Springs/Sways, Koni FSDs, Adams Rotors, Akebono Pads, SS Brake Lines, Paint Matched Calipers, Niche Misano M116 Wheels

  16. #16
    Registered Member One Ring
    Join Date
    Jan 04 2015
    AZ Member #
    307393
    Location
    NH

    I brought my 09 A6 in after noticing oil spots on the garage floor in October. Audi Nashua said 'our bad' - we mis-installed the oil filter o-ring. I don't understand why it took over 2K miles for that leak to appear - a mis-installed o-ring is a mis-installed o-ring and should have leaked since the oil change in August. The leaks never stopped and in fact worsened. Brought the car back in in mid December and was told that the upper timing chain covers were leaking. I still had secondary warranty coverage at the time and the repairs were made. The oli leaks never stopped and continued to get worse. Brought the car back in January and they added dye to the oil. The result was a $3500 estimate (nearly all labor profit) for a rear main seal failure and/or lower timing chain cover leak- no longer under warranty. 2.5 quarts of oil on my garage floor in 1 1/2 months. Audi USA, Audi Germany, dealership no help. And from what I understand, if the leak is lower timing chain cover, they have to remove the uppers and bell housing to get to it which drives the cost even higher? Can anyone confirm? Sigh.....
    2008 Audi A6 Avant 3.2L 49K miles
    2006 Audi A6 Avant 3.2L 126K miles
    2003 Audi A6 Avant 3.0L 221K miles
    2005 Audi A4 Cabriolet 3.0L 130K miles



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