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2005 325i Auto
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Yep, that initiative was a disaster. You can read the whole sordid tale here:


The ironic part is that the expansion tank isn't meant to be the weakest link in the cooling system; replace your rad cap with a lower pressure rating and you won't have to worry about the tank exploding any more.
+1 on that.

I've got the GAS 1.2bar cap, and it certainly hasn't given any trouble yet in an extremely hot Australian summer. Been watching the hidden dash temp function like a hawk.
 
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