Discover the differences between OAT and HOAT coolants to optimize engine performance and ensure ISO cleanliness targets compliance in heavy-duty fleets operating in demanding conditions.
Choose the right coolant to protect your fleet’s engines and reduce maintenance costs.
Organic Acid Technology (OAT) and Hybrid Organic Acid Technology (HOAT) coolants are advanced formulations designed to protect heavy-duty engines from corrosion, cavitation, and overheating.
OAT coolants rely on organic acids for long-lasting corrosion protection, ideal for modern engines, while HOAT coolants combine organic acids with inorganic additives like silicates for enhanced compatibility with mixed-metal systems. Selecting the right coolant ensures compliance with fluid labeling policies and extends engine life.
| Feature | OAT Coolant | HOAT Coolant |
|---|---|---|
| Inhibitor Type | Organic Acids | Organic + Inorganic |
| Service Life | Up to 1M miles | 600K-800K miles |
| Metal Compatibility | Modern Engines | Mixed Metals |
| Cavitation Protection | Good | Excellent |
| Cost | Higher | Moderate |
Understand the critical factors for selecting OAT or HOAT coolants to ensure engine protection and compliance with DEF storage and quality standards.
Follow these steps to transition to OAT or HOAT coolants while ensuring system compatibility and performance.
Assess current coolant type, engine specifications, and operating conditions.
Perform a thorough flush to remove old coolant and contaminants.
Inspect seals, gaskets, and cooling system components for compatibility.
Choosing the right coolant improves engine reliability, reduces downtime, and lowers maintenance costs for heavy fleets.
Reduction in cooling system issues
Decrease in maintenance frequency
Improvement in engine efficiency
Increase in component lifespan
"Switching to OAT coolant for our modern fleet reduced our maintenance intervals by 30% and improved engine performance in extreme conditions."
Fleet Manager, TransGlobal Logistics
Answers to common questions about selecting and managing OAT and HOAT coolants for heavy fleets.
OAT uses organic acids for corrosion protection, ideal for modern engines, while HOAT combines organic acids with inorganic additives for broader compatibility in mixed-metal systems.
No, a complete system flush is required to prevent incompatibility issues. Follow fluid labeling policy guidelines for accurate tracking.
HOAT is typically better for older engines due to its hybrid inhibitors, which provide enhanced protection for mixed-metal systems.
Test coolant every 6 months or 50,000 miles for pH, freeze point, and inhibitor levels to align with ISO cleanliness targets.
Coolant choice doesn’t directly affect DEF, but proper management ensures compatibility with DEF storage and quality requirements.
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