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This was common in the 340i, same engine as yours...B58? I had evidence of coolant leaking around one of the coolant caps. Topped off at the dealer without allowing it to cool down and I had a coolant low warning again. Went back to the dealer and they gave me a bottle of coolant to take home so I filled it up after the engine cooled down. It hasn't happened since. In a few cases, mine included, I think it was a slightly loose cap.
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