Coolant / Antifreeze (H3)
Coolants primarily differ based on their corrosion inhibitor technology and generally use a glycol (ethylene or propylene) base. The main types are Inorganic Additive Technology (IAT), Organic Acid Technology (OAT), and Hybrid Organic Acid Technology (HOAT), each designed for specific engine types and with varying lifespans.
Types: (H4)
- IAT (Inorganic Additive Technology): Older vehicles (pre-1990s), cast iron engine
- OAT (Organic Acid Technology): Modern engines, especially those with aluminum components (e.g., GM, VW, Honda, Nissan)
- HOAT (Hybrid Organic Acid Technology): European and Asian vehicles (e.g., Ford, Chrysler, BMW, Toyota, Honda)
- Si-OAT (Silicated HOAT): High-performance and luxury European vehicles (e.g., Audi, VW, Mercedes-Benz)
Key Features: (H4)
- Provides quick corrosion protection by forming a protective layer; requires frequent changes due to inhibitor depletion.
- Long-lasting corrosion protection; does not contain silicates or phosphates; better heat transfer; less maintenance.
- Combines the immediate protection of IAT with the extended life of OAT; tailored for specific regional vehicle requirements (e.g., P-HOAT for Asian, Si-OAT for European
- Enhanced protection for aluminum under high-temperature conditions; good hard water stability.