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ComStar

ComStar specializes in high-quality propylene glycol-based antifreezes and coolants for automotive and heat transfer applications, offering prediluted, ready-to-use formulas made in the USA.

4 products Updated March 4, 2026

ComStar Products (4)

1
Prime

ComStar ProFrost I-30 Propylene Glycol Antifreeze with Inhibitor - Prediluted 30% Food Grade Heat Transfer Fluid, 5 Gallon, Made in USA

ComStar
9.9
ProductReviews.org score rating is a scoring system developed by our experts. The score is from 0 to 10 based on the data collected by the ProductReviews.org tool. This score doesn't impact from any manufacturer or sales agent websites. We encourage you to write a review of your experiences with these products. Learn more »
Pros & Cons

Pros

  • Food-quality propylene glycol safe for sensitive facilities
  • Built-in corrosion inhibitor protects equipment longer
  • Non-toxic, non-irritating, and fully biodegradable
  • Prediluted convenience saves mixing time
  • Perfect for industrial refrigeration and heating applications

Cons

  • Not intended for direct food or pharmaceutical additives
  • Prediluted to 30% limits flexibility for other concentrations
  • 5-gallon size best for larger industrial needs
2
Prime

ComStar ProFrost 100 Propylene Glycol Antifreeze - Ready-to-Use 100% Food-Grade Heat Transfer Fluid, Colorless No Inhibitor, 5 Gal Made in USA

ComStar
9.8
ProductReviews.org score rating is a scoring system developed by our experts. The score is from 0 to 10 based on the data collected by the ProductReviews.org tool. This score doesn't impact from any manufacturer or sales agent websites. We encourage you to write a review of your experiences with these products. Learn more »
Pros & Cons

Pros

  • Non-toxic and biodegradable for safe use around food processing
  • Premium formula designed for extended longevity in harsh systems
  • Ready-to-use with no dilution required for convenience
  • Broad compatibility across refrigeration, heating, and solar applications
  • Colorless and inhibitor-free for customizable system needs

Cons

  • Lacks built-in corrosion inhibitors, requiring separate addition for some systems
  • 5-gallon size best suited for industrial-scale needs, not small applications
  • Not intended for direct food or pharmaceutical contact
3
Prime

ComStar ProFrost CI-100 Propylene Glycol Antifreeze, Neon Green with Inhibitor, Ready-to-Use 100% Formula, 5 Gallon - Made in USA

ComStar
9.3
ProductReviews.org score rating is a scoring system developed by our experts. The score is from 0 to 10 based on the data collected by the ProductReviews.org tool. This score doesn't impact from any manufacturer or sales agent websites. We encourage you to write a review of your experiences with these products. Learn more »
Pros & Cons

Pros

  • Food-quality and non-toxic for safe use in sensitive facilities
  • Includes corrosion inhibitor to protect systems long-term
  • Biodegradable formula minimizes environmental impact
  • Neon green color aids in leak detection
  • Ready-to-use convenience speeds up deployment

Cons

  • Not intended for direct addition to food or pharmaceuticals
  • 100% concentration may require dilution for milder freeze protection
  • Primarily suited for industrial systems, not standard automotive use
4
Pros & Cons

Pros

  • Prediluted and ready-to-use for immediate application
  • Built-in corrosion inhibitors extend equipment life
  • Neon green dye simplifies system monitoring
  • Suitable for diverse HVAC and industrial uses
  • Eco-friendly non-toxic base formula

Cons

  • Not suitable for food or pharmaceutical applications
  • Designed for industrial systems, not automotive use
  • 5-gallon size best for larger-scale needs

ComStar Brand Guide

ComStar stands out in the automotive fluids market as a reliable provider of propylene glycol-based antifreezes and coolants designed for superior heat transfer and freeze protection. Known for their ready-to-use, prediluted formulas made in the USA, ComStar products cater to a range of needs from automotive engines to industrial systems, ensuring dependable performance in extreme conditions.

Brand Overview and What Sets ComStar Apart

ComStar focuses on delivering high-performance heat transfer fluids that prioritize safety and efficiency. Their ProFrost lineup exemplifies this commitment, featuring options without inhibitors for pure applications, or with added inhibitors and colors for enhanced corrosion protection and easy identification. These products are engineered to provide excellent thermal conductivity while being non-toxic compared to traditional ethylene glycol alternatives, making them ideal for environments where safety is paramount.

What truly distinguishes ComStar is their emphasis on quality manufacturing in the USA, ensuring consistent purity and reliability. Each formula, whether 30%, 40%, 60%, or 100% propylene glycol concentration, is prediluted and ready to use, saving time and reducing the risk of mixing errors. Customers appreciate the clarity in product specifications, such as neon green coloring for visibility in systems like the CI-100 and CI-40 variants.

Product Quality and Reputation

ComStar has built a solid reputation for producing antifreezes that excel in protecting engines and cooling systems from freezing temperatures and overheating. The ProFrost I-30, for instance, offers a balanced 30% prediluted solution with inhibitors, perfect for moderate climates. Meanwhile, the pure ProFrost 100 provides 60% propylene glycol without additives, ideal for custom applications. Users consistently praise the durability and effectiveness of these fluids in maintaining optimal operating temperatures.

In the realm of Anti Freeze Liquids, ComStar's offerings shine due to their versatility across passenger vehicles, heavy-duty trucks, and even HVAC systems. The inclusion of inhibitors in models like CI-100 and CI-40 helps prevent scale, rust, and cavitation, extending the life of pumps and radiators. This focus on long-term protection underscores ComStar's dedication to quality, making their products a go-to choice for mechanics and DIY enthusiasts alike.

Who Are ComStar Products Best For?

ComStar antifreezes are tailored for a wide audience, including automotive professionals seeking bulk 5-gallon solutions for shop use, fleet managers requiring consistent performance in varied conditions, and homeowners maintaining RVs or marine engines. Their propylene glycol base appeals to those prioritizing pet-safe and environmentally friendlier options over standard coolants.

  • Mechanics and repair shops: Ready-to-use formulas speed up service times.
  • Fleet operators: Reliable freeze protection down to extreme lows.
  • DIY users: Clear labeling and no-dilution-needed convenience.
  • Industrial applications: High-purity options for closed-loop systems.

Whether you're topping off a daily driver or servicing heavy equipment, ComStar delivers the performance needed without compromise. Explore more in our Anti Freeze Liquids category for complementary products.

Key Product Categories

ComStar's portfolio centers on automotive oils and fluids, specifically antifreezes and coolants. Their products fit seamlessly into broader selections like those found in Anti Freeze Liquids, where they offer specialized propylene glycol solutions. From uninhibited pure fluids to colored, inhibitor-enhanced versions, there's a ComStar option for every protection level and system type.

Frequently Asked Questions

What is propylene glycol antifreeze, and why choose ComStar's version?

Propylene glycol antifreeze is a non-toxic alternative to ethylene glycol, offering similar freeze and boil protection with added safety for pets and wildlife. ComStar's ProFrost series stands out with USA-made quality, prediluted convenience, and options for inhibitors to suit specific needs.

Are ComStar products compatible with all engines?

ComStar recommends checking vehicle manufacturer specs, but their propylene glycol formulas are widely compatible with modern cooling systems, especially those calling for low-toxicity fluids. Always flush systems when switching types.

Do ComStar coolants require dilution?

No, all listed ProFrost products are prediluted and ready to use, from 30% to 100% concentrations, eliminating guesswork and ensuring precise protection levels.

How do inhibitors benefit ComStar antifreezes?

Inhibitors in products like ProFrost CI-100 and CI-40 prevent corrosion, scale buildup, and electrolysis, prolonging system life and maintaining efficiency over time.

Where can I find more antifreeze options like ComStar?

Check out our extensive Anti Freeze Liquids selection for top brands and formulas tailored to your vehicle or application.