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The coolant in these cars is good for 100K. I doubt the tank is "contaminated". If it was, than the rest of the system would be too and you'd have overheating issues (i.e. the radiator tubes would be clogged). Just drain and refill the coolant. There are DIYs for both the and N52 and N54 in the DIY section. The coolant drain and refill is very easy on the E90.
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