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      11-07-2019, 05:51 AM   #125
CoolWave911
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Drives: 2017 BMW G30 530i M Sport
Join Date: Oct 2019
Location: Sydney, NSW Australia

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If your G30 gave a low coolant warning more than once then chances are you're in for an expansion tank replacement down the track. Either out of your pocket or BMW's pocket is depending on how good you are at pushing BMW to do a coolant system pressure leak test. It's the second plastic tank i the engine bay with the smaller cap. Mine just cracked and leaked coolant, dripping into a puddle everytime I stopped the car. That's how I went through nearly 2l of mixed BMW blue coolant within a month....
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