The pioneer and market leader in the safer propylene glycol (PG) antifreeze category. SIERRA Antifreeze 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. A premium automotive coolant that provides excellent freeze-up and boil-over protection and outstanding corrosion protection.

• Provides excellent engine protection against freeze-up, boil-over, corrosion,
  while maintaining heat transfer properties

• Helps prevent accidental poisoning of pets

• Helps protect wildlife in the environment

Sierra Antifreeze is a propylene based antifreeze that requires the use of special ball tester to check it's  freezing point. You can find the  SIERRA Ball Tester on  247-AutoParts.com or at any Pep Boys Auto Parts Store.