2025 Ram 2500 Fluid Specs

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Quick Reference

Fluid	Type/Spec	Capacity
Engine Oil (6.4L HEMI V8)	SAE 0W-40 full synthetic meeting FCA MS-A0921	7.0 quarts (6.6L)
Engine Oil (6.7L Cummins Turbo Diesel)	SAE 10W-30 or 5W-40 CJ-4/CK-4	12.0 quarts (11.4L)
Engine Coolant	Mopar OAT (purple) meeting MS-12106	16.5-18.5 quarts (15.6-17.5L)
Transmission Fluid (8HP75 8-speed auto)	Mopar ZF 8&9 Speed ATF / MS-90030-A2	~9.0 quarts (8.5L)
Transmission Fluid (68RFE 6-speed auto)	Mopar ATF+4 / MS-9602	11.0-12.0 quarts (10.4-11.4L)
Transfer Case Fluid (BW 44-46/44-47/44-48)	Mopar BW44/48 Transfer Case Fluid	1.6-2.0 quarts (1.5-1.9L)
Front Differential Fluid	SAE 75W-85 Synthetic Gear Lubricant	2.3-2.5 quarts (2.2-2.4L)
Rear Differential Fluid (11.5/12.0 AAM)	SAE 75W-90 Synthetic Gear Lubricant	4.2-6.3 quarts (4.0-6.0L)
Brake Fluid	DOT 4	As needed
Power Steering Fluid	Electric Power Steering (EPS) - No Fluid	N/A
Washer Fluid	Mopar Washer Fluid	~1 gallon (3.8L)
Diesel Exhaust Fluid (DEF)	ISO 22241	9.0 gallons (34.1L)

Engine Oil

6.4L HEMI V8

• Specification: SAE 0W-40 full synthetic engine oil meeting Chrysler specification MS-A0921. It is critical to use oil that carries this specific certification. API certification (such as SP) is also required. Using a 5W-40 or 0W-30 weight may be permissible in certain temperature ranges, but the 0W-40 is the factory recommendation for all-around performance and longevity.
• Capacity: 7.0 quarts (6.6 liters) with filter change.
• Notes: The HEMI V8 uses a Multi-Displacement System (MDS) which deactivates cylinders to save fuel. This system relies on precise oil pressure and viscosity to function correctly. Using oil other than the specified 0W-40 can lead to MDS malfunctions, check engine lights, and potentially costly repairs to the valvetrain.

6.7L Cummins Turbo Diesel

• Specification: SAE 10W-30 is the preferred viscosity for normal operating conditions. For heavy-duty use or extreme temperatures, SAE 5W-40 is recommended. The oil must meet API CK-4 performance requirements, which supersedes the older CJ-4 spec. Look for the Cummins Engineering Standard CES 20086 on the bottle.
• Capacity: 12.0 quarts (11.4 liters) with filter change.
• Notes: Diesel engines produce soot and other contaminants that are hard on oil. Using a high-quality CK-4 certified oil is non-negotiable. Always replace the oil filter with a quality unit (like the Mopar or Fleetguard filter) at every oil change. The oil change interval can vary based on the duty cycle of the truck; the onboard oil life monitor is generally reliable, but severe use (heavy towing, constant idling) may necessitate shorter intervals.

Engine Coolant

• Specification: Mopar 10 Year/150,000 Mile OAT (Organic Acid Technology) coolant meeting Chrysler spec MS-12106. This coolant is typically purple in color.
• Capacity: System capacity is approximately 16.5 to 18.5 quarts (15.6 to 17.5 liters) depending on the engine and options.
• Notes: Crucial: Never mix coolant types. The 2025 Ram 2500 uses a specific OAT formula. Adding older HOAT (Hybrid OAT, typically pink/orange) or IAT (Inorganic Additive Technology, green) coolant can cause it to gel, leading to blockages in the radiator, heater core, and engine coolant passages. This can result in catastrophic engine overheating. If you need to top off the system, use only a coolant that explicitly meets the MS-12106 specification or distilled water in an emergency.

Transmission Fluid

• 8-Speed Automatic (8HP75, typically with HEMI V8): Requires Mopar ZF 8&9 Speed ATF, which meets Chrysler specification MS-90030-A2. This is a highly specific, low-viscosity fluid.
• 6-Speed Automatic (68RFE, typically with Cummins Diesel): Requires Mopar ATF+4, meeting Chrysler specification MS-9602.
• Notes: There is absolutely no interchangeability between these fluids. Using ATF+4 in a ZF 8-speed or vice-versa will cause severe shift problems, internal damage, and eventual transmission failure. "Universal" or "multi-vehicle" ATFs are not a substitute. These transmissions are "fill for life" according to the manufacturer, but a fluid and filter change every 60,000-100,000 miles is wise preventative maintenance, especially for trucks that tow.

Transfer Case Fluid

• Specification: Mopar BW44/48 Transfer Case Fluid. This is a specific fluid for the BorgWarner electronic-shift transfer cases used in these trucks.
• Capacity: Approximately 1.6 to 2.0 quarts (1.5 to 1.9 liters).
• Notes: Do not use standard ATF or gear oil in the transfer case. Using the wrong fluid can damage the clutch packs and chain, leading to shifting problems and complete failure. The fluid should be changed every 30,000 to 50,000 miles, depending on 4WD usage.

Differential Fluid

• Front Axle (9.25 AAM): SAE 75W-85 Synthetic Gear Lubricant.
• Rear Axle (11.5/12.0 AAM): SAE 75W-90 Synthetic Gear Lubricant.
• Notes: If the truck is equipped with a limited-slip differential (LSD), a friction modifier additive must be added to the gear oil to prevent clutch chatter and binding. Many synthetic gear oils already contain this additive, but it is crucial to verify. Always check the axle tag or build sheet to confirm the differential type. Capacities can vary slightly, so fill until the fluid is level with the bottom of the fill plug hole.

Brake & Power Steering Fluid

• Brake Fluid: DOT 4. The system should be flushed and bled every 2-3 years, as brake fluid is hygroscopic (absorbs moisture), which can lead to a spongy pedal and corrosion of internal brake components.
• Power Steering Fluid: The 2025 Ram 2500 uses an Electric Power Steering (EPS) system and therefore has no hydraulic power steering fluid to check or change.

Washer Fluid & DEF

• Washer Fluid: Use any quality washer fluid. Mopar offers a formula that is effective at low temperatures.
• Diesel Exhaust Fluid (DEF) (6.7L Cummins only): Requires API certified Diesel Exhaust Fluid that meets ISO 22241. This is standard for all modern diesel engines with Selective Catalytic Reduction (SCR) systems. The tank is 9.0 gallons and is located on the driver's side of the truck. Never put DEF in the diesel fuel tank, or diesel fuel in the DEF tank – this will cause immediate and extensive damage to the fuel system or exhaust after-treatment system.

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