Good morning to everyone , Have a little problem or my wife has put hand on my 650xi. Saturday I was working on and my wife took my 650xi because she wanted to go to the city ,then came the message cooling water please refill blah. She called me and because I had no time ,I told her that she should pay attention to the on top of it that you should be careful because of internal combustion engine danger etc if she can find the lid she Wass he pour in .naja my mistake because the 650xi has yes two of them, once the main balance tank centered at the front of the engine and once on the driver side at the back. My wife filled it naturally at the far back where not even a min. Max. marking is .. my question: what is the one on the driver side? And is that bad if you have filled in 500-800ml water? By the way, the message did not come to him anymore.. I guess because the 650 yes water cooled turbo or charge airk ühler has, there are two salaries for cooling water , but they would have to hang in the same cycle or ? Would be great if someone had an answer to the questions since I unfortunately did not find anything on the net .. nice day to all of you and enjoy the sun my dear ..