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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > DEF Draining



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      11-19-2013, 08:50 AM   #1
oldsankey
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DEF Draining

Has anyone drained their DEF tanks? Apparently there's a tee splitter line that you can separate to drain the fluid under the trunk area...Any photos would be much appreciated.
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      11-19-2013, 09:09 AM   #2
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I think that would be a good idea to do. As we all know this was done at every service interval the first year or two. BMW at one point determined it was needed and then discontinued for what ever reason which was probably cost.
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      11-19-2013, 12:36 PM   #3
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Haven't considered it.
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      11-19-2013, 01:28 PM   #4
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http://www.e90post.com/forums/showthread.php?t=518983

post #4 by montr has a pdf on the "official" procedure for draining DEF.
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      11-19-2013, 02:16 PM   #5
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Thank you! I need to empty out before a hard freeze and running out of time.
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      11-19-2013, 02:40 PM   #6
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Quote:
Originally Posted by oldsankey View Post
Thank you! I need to empty out before a hard freeze and running out of time.
Good luck. Please let us know how it goes. I'm considering doing this as well.
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      12-01-2013, 05:10 PM   #7
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oldsankey, how did this work out for you?

I was able to gravity drain (it took a long time) 3.5 gallons out of the passive tank this afternoon. Let it drip/drain into 1 gallon washer fluid containers. Having something that would pull a vacuum would make it go a lot quicker.
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      12-01-2013, 05:32 PM   #8
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I dont see the benefit here unless you drop the tanks and clean them out with some kind of solvent after draining them.
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      12-01-2013, 05:54 PM   #9
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Quote:
Originally Posted by Quasimodem View Post
I dont see the benefit here unless you drop the tanks and clean them out with some kind of solvent after draining them.
Hypothetically, if the urea was no longer needed, carrying around the extra weight would not be a benefit...
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      12-01-2013, 06:29 PM   #10
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Quote:
Originally Posted by Quasimodem View Post
I dont see the benefit here unless you drop the tanks and clean them out with some kind of solvent after draining them.
If I remember correctly, to clean the DEF and prevent crystallization, you just need to flush with distilled water.
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      12-01-2013, 08:10 PM   #11
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Quote:
Originally Posted by montr View Post
If I remember correctly, to clean the DEF and prevent crystallization, you just need to flush with distilled water.
Yes, I see that crystalization every time I spill, err fill, my tank. My concern about emptying the tank and then merely refilling it is that it may cause more crystalization in the tank then there was first. If I was to do that I would want to flush it out after draining it. If DI water is the best flush, that's great.
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      12-01-2013, 09:09 PM   #12
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Quote:
Originally Posted by Quasimodem View Post
Yes, I see that crystalization every time I spill, err fill, my tank. My concern about emptying the tank and then merely refilling it is that it may cause more crystalization in the tank then there was first. If I was to do that I would want to flush it out after draining it. If DI water is the best flush, that's great.
Here is the bulletin on extracting the DEF. They do not mention flushing the system directly. Here is what is said:
"Always rinse the tools, lines, and fittings with water after each use"

This is not a BMW bulletin but Cummins recommend flushing the system with distilled water
http://www.mcicoach.com/fyiFromMci/m...tters/1012.htm
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File Type: pdf DEF Extraction and Refill.pdf (416.7 KB, 90 views)

Last edited by montr; 12-01-2013 at 09:49 PM. Reason: Added info from Cummins
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      12-02-2013, 09:06 AM   #13
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Quote:
Originally Posted by oldsankey View Post
Thank you! I need to empty out before a hard freeze and running out of time.
Urea freezes at 19F. In addition the active tank is heated. Why would you drain?
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      12-03-2013, 06:16 AM   #14
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dont worry mines will be removed eventually!!!
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