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					Originally Posted by 78F350  The best automotive analogy I can think of is an aged out tire. Even if it has tread left, the material is degraded throughout.  You can put a tube inside and get some more miles from it, but at any time it could fail catastrophically. The material of the coolant tank has been pressurized and heated for many thousands of cycles. The bonds that bind the plastic on a microscopic level are failing. I don't think there is any practical way to extend it's use. Any patching of a crack would be short lived as the crack extends or a new one develops outside the patch.
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Well you let the air out of my tires   
Sounds logical to me.
		 
				__________________Grant
 Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
 Green 2000 Boxster 5-speed and 1978 928 auto
 1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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