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Join Date: May 2010
Location: Dallas, TX
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As is noted, this is a common problem. If you look inside the lower grille at the top left of the oil cooler (facing the bumper of course), you will see this is where the two lines come into the oil cooler. If this is not where yours is leaking from, you may have a completely different problem.
Mine is leaking at this location, and there are several options. Replace the oil cooler, replace the lines, replace both the oil cooler and lines, or start small and work to big. Meaning, there are two o-rings which fit inside this connection. They are $4 each at a BMW dealership (part 8 on the link above). Crimp the lines and replace the o-ring. If the leak stops, problem solved. If not, continue to problem solve.
I purchased the two o-rings, and it should take me a few hours to replace and test. $8 and a few hours is worth it to me to try and address the issue prior to dropping it off at the stealership.
Last edited by dannboss; 11th January 2011 at 12:04 AM.