The 55 Gallon Prestone Command Heavy Duty Nitrite Free Extended Life Antifreeze/Coolant 50/50 is a Nitrite‑Free ELC (OAT) antifreeze/coolant from Prestone. Available as a 50/50 premix formula. Provides freeze protection to -34°F and a service life of 8–10 Years. Designed for Heavy‑Duty Diesel.

• Brand: Prestone
• Type/Chemistry: Nitrite‑Free ELC (OAT)
• Color: Red
• Dilution Ratio: 50/50 Premix
• Freeze Protection: -34°F
• Boil Protection: 265°F
• Vehicle Compatibility: HD Diesel / NF Systems
• Service Life: 8–10 Years
• Corrosion Protection: Aluminum & Iron
• Additive Package: Nitrite‑Free OAT
• pH Level: 8.0–9.0
• Container Size: 55 Gallon
• Shelf Life: 5+ Years
• Package Size: 55 Gallon

• Heavy-duty diesel engine cooling systems
• Commercial truck and bus cooling systems
• Off-highway and construction equipment
• Fleet diesel vehicle maintenance
• Industrial engine cooling applications

Compatible with HD Diesel / NF Systems. Additive package: Nitrite‑Free OAT.

Service life: 8–10 Years. Shelf life: 5+ Years. Dispose of used coolant in accordance with local environmental regulations. Do not mix with other coolant types without flushing the system.