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This happened to me earlier in the year on my 2019 540ix with less then 5k miles. Then it went away but came back recently right before the cars one year maintenance. I ask BMW service the same question. Just 1 year and 5k miles???
They told me that there are two coolant tanks and that this is common because it's used to cool the turbos and they run hot.
Don't know but I took him at his word.
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