
01/07/12, 07:48 PM
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Join Date: May 2002
Posts: 7,692
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The expansion tanks are for antifreeze heated to well over 200 degrees under pressure. Doesnt get that hot here, though last summer felt like it did. Very little expansion of antifreeze at around 100 degrees ambient temp. And antifreeze shouldnt freeze, or at least it sure doesnt get below its stated protection point around here so no expansion from freezing.
Oil doesnt freeze, it just gets thicker. Doesnt appreciably expand at ambient temp.
If I havent made it clear, ITS OBVIOUS THE CRACKS ARE FROM DETERIORATION AND BREAKDOWN OF THE PLASTIC, not thermal expansion. THE PLASTIC IS BRITTLE!!!!!! If it were from thermal expansion on one of those theoretical 300 degree days, the bottle would pop, but the plastic would not be BRITTLE!!!!
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