PEAK Sierra Antifreeze/Coolant 1 Gal — Propylene Glycol, Lower Toxicity Heat Protection

PEAK Sierra Antifreeze/Coolant (1 gallon) is a propylene-glycol based engine coolant that helps regulate temperature and reduce toxicity compared with ethylene-glycol formulas.

Designed for light- and heavy-duty vehicles, this PEAK Sierra formula uses propylene glycol instead of ethylene glycol, offering lower toxicity while still delivering reliable heat transfer and freeze protection for automotive cooling systems. Packaged in a convenient plastic gallon bottle, the product is ready to add to compatible cooling systems either as a full-strength fill or mixed per manufacturer recommendations. It’s formulated for broad compatibility and aims to deliver long-lasting performance when used according to vehicle specifications.

How does this coolant protect my engine on hot summer roads?

PEAK Sierra transfers heat away from the engine block and radiator, helping the system maintain stable operating temperatures during high-load or high-ambient-temperature conditions. Stable boiling points and effective heat transfer reduce the risk of overheating when the cooling system is functioning correctly.

• Propylene glycol base supports efficient heat exchange
• Formulated for consistent thermal performance under load
• Suitable for radiators where propylene-glycol coolants are recommended

Is this antifreeze safer for household and pet exposure than standard formulas?

Because it replaces ethylene glycol with propylene glycol, this PEAK Sierra coolant has a lower toxicity profile, which can reduce acute poisoning risk if accidental contact or ingestion occurs. It should still be handled and stored carefully—no coolant is entirely nonhazardous—so follow label instructions and keep containers out of reach of children and pets.

• Propylene glycol formulation is less toxic than ethylene glycol
• Use standard safety precautions during handling and disposal
• Store in original sealed plastic bottle away from pets and children

How should I use and dilute PEAK Sierra Antifreeze/Coolant?

Check your vehicle manufacturer’s recommendations for coolant type and concentration before adding. Some systems require pre-diluted coolant while others need a concentrate mixed with distilled water; follow the label or service manual to achieve the correct freeze/boil protection and corrosion control balance.

• Consult vehicle manual for proper mixture ratio (pre-diluted vs. concentrate)
• Use distilled water to mix if dilution is required
• Ensure system is cool before opening radiator or reservoir for safe filling

Will this product work with my car’s current antifreeze?

Compatibility depends on the existing coolant chemistry and manufacturer guidance. While many cooling systems accept propylene-glycol formulas, mixing different proprietary inhibitor technologies can affect performance; when in doubt, perform a flush or consult a technician to avoid incompatibility issues.

• Suitable for systems that accept propylene-glycol coolants
• Avoid mixing with incompatible inhibitor technologies without guidance
• Consider a cooling-system flush before switching formulas

Who is this product for? PEAK Sierra Antifreeze/Coolant (1 gallon) is aimed at vehicle owners and professional shops seeking a less toxic, propylene-glycol based coolant for everyday passenger cars, light trucks, and equipment that specify or accept propylene-glycol formulas. It’s a practical option for drivers who want a ready-to-use container for topping off or for technicians who need a single-gallon supply for service jobs. Always confirm your vehicle’s coolant requirements and follow disposal regulations for used fluids.