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We purchased some Sierra Antifreeze. It uses propylene glycol, which is significantly less toxic than ethylene glycol. Do be extra careful to flush out all of the old antifreeze, though, and don't mix it. For a public health statement on ethylene and propylene glycol, check out this article from The US Department of Health and Human Services. Despite some grumbling about the initial marketing of this product, it does appear to be a much safer choice for antifreeze. Can't please everybody, I suppose.
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