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      07-10-2018, 10:02 PM   #1
manny1424
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HELP OIL in Coolant Tank!!!

Hey everyone so I bought my Comp 2014 m5 5 months ago with only 24k miles. The cars runs great and not a single issue and the car is bone stock.

However a little bit a go I noticed a little oil residue in my coolant tank (the turbo/chargecooler coolant tank no the engine). The car runs and pulls great so we though the tank might have been contaminated since it was very little traces of oil in the coolant tank. So we replaced the tank a month ago.

So I just took a look at it again and there is oil residue again in the tank. From my research this is the coolant tank that goes to the charge coolers. I am talking about the coolant tank on the passenger side of the vehicle. I have attached some picture of what it looks like.

Has this happened to anyone or any thoughts? The car is too new with too little miles for me to think its a head gasket or anything major. The car was not modified from what I know prior to me and it was a lease return.

https://photos.app.goo.gl/p4d5U6LZu586HZ3r6

https://photos.app.goo.gl/C26jqn2a8M1TTvph8

Last edited by manny1424; 07-10-2018 at 10:09 PM..
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      07-11-2018, 04:38 AM   #2
Craze
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Not sure
Take it to bmw and let them deal with it
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      07-11-2018, 11:38 AM   #3
manny1424
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Quote:
Originally Posted by Craze View Post
Not sure
Take it to bmw and let them deal with it
Problem is the car does not have warranty and knowing the dealer they will end up taking apart my engine and still not find the problem.
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      07-16-2018, 11:35 AM   #4
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I would start by flushing this rather small coolant circuit, then re-check after refilling and driving.
If it's there again, it could be a leak from the oil side of the turbos

This circuit is for the turbo cooling, not the engine....so I doubt you have any engine issues.
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      07-16-2018, 12:12 PM   #5
manny1424
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Quote:
Originally Posted by Fast400 View Post
I would start by flushing this rather small coolant circuit, then re-check after refilling and driving.
If it's there again, it could be a leak from the oil side of the turbos

This circuit is for the turbo cooling, not the engine....so I doubt you have any engine issues.

I already flushed it and replaced that reservoir with a brand new one and it came back. I am thinking there might have been residue in the lines and charge cooler that is why it came back. As far as the Turbos would it possible to come from there because the turbo pulls the oil from the engine?
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