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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 > Oil in coolant



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      10-02-2015, 08:08 AM   #1
m-power_tuning
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Oil in coolant

Hi guys,

Im wondering if anyone has come across the issue of finding quite a large amount of oil in the coolant tank.
The car is a 2006 335d m sport, runs fine no problems with start up or power. Everything is as it should be.

Ive had it looked at by a garage and they have said it may be the oil cooler and its a good place to start as it wont be as expensive as checking head gaskets, cracked head etc.

Having trouble finding the part number for the oil cooler and was wondering if anyone can help. Keep coming across a heat exchanger would that be the same thing?

Thanks in advance
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      10-02-2015, 08:54 AM   #2
nwsnowboarder
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I think your mechanical is thinking there is an integrated oil cooler in the radiator which has failed and allowed co-mingling of the fluids, but I don't see that is the case with a 335d

There is a heat exchanger, part of the oil filter housing assy #11 42 7 788 462, but coolant doesn't flow through it.
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      10-02-2015, 09:29 AM   #3
m-power_tuning
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thanks for the response. So what i believe your saying is i dont have an oil cooler. Would there be anywhere else oil and coolant can mix?
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      10-02-2015, 10:08 AM   #4
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Ive just called bmw parts department to get a quote on an oil cooler. I provided my reg and he came back with a price on one at 120+vat. He wouldnt provide me with tha part number. He also confirmed the heat exchanger is a different part.
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      10-02-2015, 10:59 AM   #5
nwsnowboarder
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That price would be around what the Auxiliary Radiator would cost, but I don't see oil circulating through it on the online diagrams.

Coolant does appear to circulate through the Heat Exchanger though.

Seems like a lot of money to spend on a part that might not fix the problem. Wouldn't it be better to pull the suspected failed part, pressurize it and see if there is a drop in pressure?
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      10-03-2015, 10:34 AM   #6
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You most definitely have an oil cooler every diesel I have ever worked on has some sort of oil cooler. I believe its located on the side of the oil filter housing, should be coolant lines going into it.
Proper procedure is, pull oil cooler pressurize oil side and immerse in water, that being said not the most reliable way. I have seen an oil cooler with a hair line crack that would leak only when the cooler was heated so on the bench test wouldnt leak. Cost the shop a headgasket job instead of the oil cooler. I just throw oil coolers at the big diesels I work on and 9 times out of ten its been the oil cooler, a little crude but its worked for me..
Yes its a lot of money for an oil cooler but if I was you I would replace the oil cooler, flush the rad system multiple times using water and some sort of rad solution cleaner, (its basically dishwasher detergent) 3 times at least, get the car up to operating temp etc, oil will stick to the liners and can give you a false reading at a later date. Refill with antifreeze and monitor, change the oil too, and get a used oil analysis at the next scheduled interval date.
Better $500 then $2500-3500
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      10-03-2015, 12:19 PM   #7
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glitdi, are you a big rig mechanic? Great resource to ask stuff if so. Thanks for the oil cooler tech info.
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      10-03-2015, 12:41 PM   #8
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Quote:
Originally Posted by nwsnowboarder View Post
I think your mechanical is thinking there is an integrated oil cooler in the radiator which has failed and allowed co-mingling of the fluids, but I don't see that is the case with a 335d

There is a heat exchanger, part of the oil filter housing assy #11 42 7 788 462, but coolant doesn't flow through it.
Actually coolant does flow through the heat exchanger. Please see these links:
http://www.realoem.com/bmw/enUS/show...diagId=11_2328
http://www.realoem.com/bmw/enUS/show...diagId=11_3466

To the OP. Do you see oil yourself or a garage is telling you there is oil in your cooling system?

The part is not that expensive to replace. Will need gaskets as well.
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      10-03-2015, 04:50 PM   #9
glitdi
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Quote:
Originally Posted by BB_cuda View Post
glitdi, are you a big rig mechanic? Great resource to ask stuff if so. Thanks for the oil cooler tech info.
Yes and no
I am a specialist on German made mobile hydraulic cranes... Stuff like this http://www.liebherr.ca/AT/en-GB/prod...ic/tab-2282_29
As part of my job I have to work on the support equipment including heavy trucks, small engines, trailers, fleet of f-150 etc.. As an Hd mechanic I am expected to fix anything and everything... However I am very particular to German brand stuff and Diesel specifically. VWs, Bmw, Mercedes etc...
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      10-03-2015, 05:04 PM   #10
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glitdi, tell BB_cuda what you do in your home garage though....
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      10-03-2015, 05:09 PM   #11
nwsnowboarder
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Quote:
Originally Posted by Yozh View Post
Actually coolant does flow through the heat exchanger. Please see these links:
http://www.realoem.com/bmw/enUS/show...diagId=11_2328
http://www.realoem.com/bmw/enUS/show...diagId=11_3466

To the OP. Do you see oil yourself or a garage is telling you there is oil in your cooling system?

The part is not that expensive to replace. Will need gaskets as well.
Thanks for the links, If you read further down I stated that the 335d has two radiators and a heat exchanger. The OP was originally stating 'Oil Cooler' not 'Heat Exchanger.' Not all diesels have oil coolers, certainly the VW and early MB's didn't have them. On my newer MB and Land Rover diesel the oil cooler is integrated into the radiator. A good radiator shop should be able to clean and test the heat exchanger which would validate the theory that the heat exchanger failed. I wouldn't want to spend the money, (parts & labor) on replacing the heat exchanger just to find out it was really the head gasket. On my Yanmar diesel, the coolant heat exchanger can be disassembled, cleaned, gaskets replaced, and put back together.
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