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This doesn't seem to be a big problem with the Z4, at least not yet. On the E46, it's almost a right of passage to replace the entire cooling system. They also replace the exp tank cap with one that vents at a lower temp/pressure, as some think that something goes wrong and causes a pressure spike, and that is what causes the exp tank to fail. I actually have an exp tank, hoses, transmission thermostat, new water pump, etc. ready to go into my son's E46.
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2006 BMW Z4M Interlagos Blue/Black
Aux Port|LED Interior|LED Strip Trunk|Underseat First Aid Box|Stubby Antenna|Intravee II|BMW Oil Change Kit|Top Down Side Panels|Vibra Technics Engine Mounts|Rogue Trans Mounts|Engine Mount Bolts Upgrade|RS Windblocker|Euro Front Plate|M5 Illum Shift Knob|Supersprint Powerloop Exhaust|Gruppe-M Intake|RPI Scoop|Black Grills|19x8.5 ET35 F 19x9.5 ET22 R Sportline 8s PSS| Besian Vanos|CDV Delete
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