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