RAM 2500 2021 Owner's Manual page 485

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Component
Fuel Selection
Diesel Exhaust Fluid
Fluid, Lubricant, or Genuine Part
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 (API Certified) (DEF) 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).
TECHNICAL SPECIFICATIONS
483
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