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I have gone through 2 expansion tanks in five years of ownership on my 3.0i. The first cracked and I ended up doing a cooling system overhaul a couple of years ago (thermostat was also cracked) and another just a few weeks ago.
To be fair, it is outside in the wild year round so it is subject to the crazy weather we have in the Chicago area, so I regard the expansion tank cracking as just part of the territory for me using a Z year round!
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2017 M2 - Camber Hubs, MPE, and some other goodies
2006 Z4M - Epic Tune / Eventuri CAI / Euro Headers / Stromung / FA 500 / AS SSK / Arc 8s
2004 Z4 3.0i - Gone, but not forgotten! |