Prestone Command® Heavy Duty Nitrite Free Extended Life and 50/50 Antifreeze/Coolant are Organic Acid Technology (OAT) for use and compatible with ANY OAT extended life heavy duty antifreeze/coolant in ANY diesel-powered commercial vehicle engine or stationary engine. Its advanced, patented formulation is a concentrated blend of premium long-lasting inhibitors to provide up to 750,000 miles/15,000 hours* of protection against temperature extremes, rust, corrosion, scale, and premature water pump failure.

*To achieve 750K mile extended service life, follow these steps. Step 1: Perform a cooling system flush and then fill the cooling system with the proper mixture of Prestone Command® Nitrite Free coolant and high quality water. Step 2: As coolant level drops through normal engine use, top up using only Prestone Command® Nitrite Free prediluted coolant as necessary. Step 3: Test coolant at least twice a year, Spring & Fall, every PM is preferred – use a refractometer to make sure your coolant is adjusted to the correct coolant/water mixture and then use test strips to assess nitrite contamination (nitrite contamination can occur when adding a Nitrite Organic Acid Technology (NOAT) to a OAT), and test pH. Use new coolant if replacing a cooling system part.



When used as directed, Prestone Command® Heavy Duty Nitrite Free ELC formulations provide long-lasting inhibition and corrosion protection. For additional product specifications, please reference our product data sheets.

General Description

CompositionTypical Values
Ethylene Glycol and Inhibitors:
50 vol %51%
50 vol %49%
Pack/UnitJug / Drum / Tote
Average Fluid Weight/Unitat 68°F (20°C):
Concentrate9.3 lb (4.2 kg) / gal (3.78 L)
50 vol %8.9 lb (4.0 kg) / gal (3.78 L)
Features & Benefits
  • Compatible with ANY OAT Extended Life heavy duty antifreeze/coolant
  • Provides excellent protection for aluminum and all other engine metals
  • Complete liner pitting and corrosion protection
  • Service life 750,000 miles/15,000 hours
  • Helps lower maintenance costs and improve water pump life
  • Eliminates the need to add supplemental coolant additives or use a SCA charged coolant filter
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