RAM 2500 2023 Owner's Manual page 449

Component
Fuel Selection
Diesel Exhaust Fluid
 Mixing of engine coolant (antifreeze) other than specified Organic Additive Technology (OAT) engine coolant (antifreeze), may result in engine damage and may decrease corrosion
protection. Organic Additive Technology (OAT) engine coolant is different and should not be mixed with Hybrid Organic Additive Technology (HOAT) engine coolant (antifreeze) or
any "globally compatible" coolant (antifreeze). If a non-OAT engine coolant (antifreeze) is introduced into the cooling system in an emergency, the cooling system will need to be
drained, flushed, and refilled with fresh OAT coolant (conforming to MS.90032), by an authorized dealer as soon as possible.
 Do not use water alone or alcohol-based engine coolant (antifreeze) products. Do not use additional rust inhibitors or antirust products, as they may not be compatible with the
radiator engine coolant and may plug the radiator.
 This vehicle has not been designed for use with propylene glycol-based engine coolant (antifreeze). Use of propylene glycol-based engine coolant (antifreeze) is not recommended.
Use good quality diesel fuel from a reputable supplier in your vehicle. Federal law requires that you must fuel this vehicle
with Ultra Low Sulfur Highway Diesel fuel (15 ppm Sulfur maximum) and prohibits the use of Low Sulfur Highway Diesel
fuel (500 ppm Sulfur maximum) to avoid damage to the emissions control system.
For most year-round service, Number 2 Diesel fuel meeting ASTM specification D-975 Grade S15 will provide good
performance.
If climatized or diesel Number 1 ULSD fuel is not available, and you are operating below (20°F/-6°C), in sustained arctic
conditions, Mopar® Premium Diesel Fuel Treatment (or equivalent) is recommended to avoid gelling.
This vehicle is fully compatible with biodiesel blends up to 5% biodiesel meeting ASTM specification D-975. Pickup
models configured with optional B20 capability, are additionally compatible with 20% biodiesel meeting ASTM
specification D-7467.
Mopar® Diesel Exhaust Fluid (DEF) (API Certified) or equivalent that has been API Certified to the ISO 22241 standard.
Use of fluids not API Certified to ISO 22241 may result in system damage. You can receive assistance in locating DEF in
the United States by calling 866-RAM-INFO (866-726-4636). In Canada call 1–800–465–2001 (English) or
1–800–387–9983 (French).
CAUTION!
TECHNICAL SPECIFICATIONS
Fluid, Lubricant, or Genuine Part
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