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Old 09-01-2013, 07:45 AM   #180
Geoffster
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Joined: Nov 2008
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Quote:
Originally Posted by JRose View Post
I don't see how Ethanol can cause a crack in what essentially is a cover. The contents of the bladder do not come in contact with the black part that is cracking.
Some believe that the dribbles that spill out of the tank when trying to fill it 100% lead to the cracks.

I simply don't know. Disturbingly, neither do the engineers at BMW!
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