Peak is the pioneer and market leader in the safer propylene glycol (PG) antifreeze category. Sierra antifreeze or coolant is formulated with PG rather than ethylene glycol the base for traditional antifreeze. 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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Provides excellent engine protection against freeze-up, boil-over and corrosion, while maintaining heat transfer properties
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Helps prevent accidental poisoning of pets
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Helps protect wildlife in the environment Sierra antifreeze is a propylene-based antifreeze that requires the use of a special ball tester to check its freezing point
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Biodegradable
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Non-toxic propylene glycol
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Does not contain poisonous ethylene glycol making it safer for pets
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