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Oil in coolant
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10-02-2015, 07:08 AM | #1 |
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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 |
10-02-2015, 07:54 AM | #2 |
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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, 09:08 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, 09:59 AM | #5 |
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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, 09:34 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 Re |
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10-03-2015, 11:41 AM | #8 | |
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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, 03:50 PM | #9 | |
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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, 04:09 PM | #11 | |
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