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      10-01-2009, 12:08 PM   #1
AlanAZ
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Drives: E90 325i sport manual
Join Date: Aug 2009
Location: Scottsdale, AZ

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How much coolant loss is normal?

I've lost 1/4 of inch on the coolant gauge in the reservoir tank over 2 months and 1,500 mls (admittedly during summer in Arizona.) It's a 06 325i with 60,000 mls, and I don't know it's history of coolant loss since I bought it 3 months ago. Car runs fine, no coolant on the floor or in exhaust.

I've read here that some coolant loss is normal, still this loss seems high, 1.5 inches per year on the gauge if I extrapolate. What's the usual rate of loss? Any typical cause for a higher rate of loss?

I bought an fluorescent dye to add to the coolant to identify any seepage or weeping. Any issues with using this with BMW's coolant (it says not to use with GMs Dex-cool, no mention of BMW)?

Thanks.
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