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PEAK® is the pioneer and market leader in the safer propylene glycol antifreeze category. SIERRA® antifreeze/coolant is formulated with PG rather than ethylene glycol, the base for traditional anti-freeze. Because of its PG formula, SIERRA® antifreeze is less toxic and therefore safer for people, pets and wildlife than conventional antifreeze. It is a premium automotive coolant that provides excellent freeze-up and boil-over protection and outstanding corrosion protection.
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