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      02-09-2012, 03:53 PM   #3
mike3000fl
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Drives: 06 330i
Join Date: Feb 2010
Location: Tampa

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It supposedly is a sealed system but at the same time I have heard that it is not. I believe the consensus is that it should not lose fluid. I do know that our expansion tank is under pressure which is different to many cars where the expansion tank is a plastic bottle like the wiper fluid (flip cap and all).

I top mine up every other month or so, not much loss, dipstick is just a bit lower.