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My 440ix B58 is at BMW dealer now, as they insisted coolant loss is not a normal thing on any car. As no leak could be found and pressure OK, BMW is gonna check and replace the turbocharger. According to them several cases of unexplained coolant loss reported in Germany and Belgium, all solved by replacing turbocharger.
My car has 16000 miles.
All costs incl loaner on BMW account (warranty).
I keep you informed, as it looks like several B58 owners have the low coolant issue.
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