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      02-14-2011, 06:48 AM   #5
onebluemcm
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Drives: '07 Z4MC
Join Date: Apr 2010
Location: Richmond, VA

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Nice write up - I've been wondering about this too so it's great to see some one dig into it. Mines a September '06 build with just under 25K and the age of the coolant more than the miles is my concern as well. This is definitely on my spring to-do list.

Do you think this procedure would be the same on a Z4M?

Just to add to the type of water questions - as santov said, use only distilled water, even for flushing. You do not want to add tap water at any time because you'll probably never get it all out and it may contain increased mineral content, which will vary depending on where you live. Just buy plenty of distilled, it's cheap and not like you're going to be doing coolant flushes that often.
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