2015 Ram 3500 Fluid Type Specs

Quick Reference

Fluid	Type/Spec	Capacity
Engine Oil (6.7L Cummins)	15W-40 or 5W-40 Synthetic, API CJ-4 (now CK-4), CES 20081	12.0 qt (11.4 L)
Engine Oil (6.4L HEMI V8)	0W-40 Synthetic, API SN, MS-12633	7.0 qt (6.6 L)
Engine Oil (5.7L HEMI V8)	5W-20, API SN, MS-6395	7.0 qt (6.6 L)
Engine Coolant	Mopar OAT (Purple), MS-12106	10.3 - 24.3 qt (9.7 - 23 L) - Varies by engine/options
Automatic Transmission (68RFE)	Mopar ATF+4, MS-9602	11.0 - 17.5 qt (10.4 - 16.6 L)
Automatic Transmission (Aisin AS69RC)	Mopar ASRC, MS-90189	13.7 qt (13 L)
Manual Transmission (G56)	Mopar ATF+4, MS-9602	6.0 qt (5.7 L)
Transfer Case (BW 44-46/44-47)	Mopar ATF+4, MS-9602	1.9 qt (1.8 L)
Front Differential (9.25" AAM)	75W-90 Synthetic Gear Lubricant, GL-5	2.4 qt (2.25 L)
Rear Differential (11.5"/11.8" AAM)	75W-90 Synthetic Gear Lubricant, GL-5	4.4 qt (4.2 L)
Brake Fluid	DOT 3	As required
Power Steering Fluid	Electric / Electric-Hydraulic (No fluid)	N/A
Washer Fluid	Mopar Washer Fluid or equivalent	As required
Diesel Exhaust Fluid (DEF)	API Certified (ISO 22241)	5.5 gal (20.8 L)

Engine Oil

6.7L Cummins Turbo Diesel: The factory recommendation is a heavy-duty diesel engine oil meeting API CJ-4 certification (now superseded by API CK-4) and Cummins CES 20081. The preferred viscosity is 15W-40 for most climates, but 5W-40 synthetic is recommended for cold weather operation. Oil capacity is 12.0 quarts (11.4 liters) with a filter change.

6.4L HEMI V8: This engine requires a high-performance 0W-40 synthetic oil that meets Chrysler MS-12633. Using other oils can lead to improper engine operation and potential long-term damage. The capacity is 7.0 quarts (6.6 liters).

5.7L HEMI V8: Use a quality 5W-20 oil meeting Chrysler MS-6395. Using the correct viscosity is critical for the proper function of the Multi-Displacement System (MDS). The capacity is 7.0 quarts (6.6 liters).

Engine Coolant

The 2015 Ram 3500 was factory-filled with a Mopar OAT (Organic Acid Technology) coolant meeting Chrysler specification MS-12106. This is a 10-year, 150,000-mile coolant, easily identified by its purple color.

CRITICAL NOTE: Do not mix this with other coolant types, especially the older orange/red HOAT (Hybrid Organic Acid Technology) coolant used in previous model years. Mixing OAT and HOAT will cause the coolant to gel, leading to blockages, overheating, and expensive damage to the entire cooling system. If you are unsure what is in the system, a complete flush is the only safe option.

Transmission Fluid

68RFE Automatic Transmission: This common 6-speed automatic requires Mopar ATF+4 meeting specification MS-9602. This is a very specific fluid. Never use "universal" or multi-vehicle ATF. Use only licensed ATF+4 fluid.

Aisin AS69RC Automatic Transmission: Found on High-Output Cummins models, this heavy-duty transmission requires a specific fluid, Mopar ASRC Automatic Transmission Fluid, meeting MS-90189.

G56 Manual Transmission: This 6-speed manual transmission surprisingly does not use gear oil. The correct fluid is Mopar ATF+4.

Transfer Case Fluid

For all 4WD models, the BorgWarner transfer case requires Mopar ATF+4 (MS-9602). Do not substitute with gear oil. Capacity is approximately 1.9 quarts (1.8 liters).

Differential Fluid

Front Axle (9.25" AAM): Requires 75W-90 Synthetic Gear Lubricant meeting API GL-5. Total capacity is around 2.4 quarts (2.25 liters).

Rear Axle (11.5"/11.8" AAM): Requires 75W-90 Synthetic Gear Lubricant meeting API GL-5. If the truck is equipped with a limited-slip differential (LSD), a friction modifier additive must be included unless the chosen gear oil already contains it.

Brake Fluid

The hydraulic brake system requires DOT 3 brake fluid. It is acceptable to use DOT 4 as it has a higher boiling point, but do not use DOT 5 (silicone-based) as it is incompatible. Brake fluid is hygroscopic (absorbs moisture) and should be flushed every 2-3 years.

Power Steering Fluid

The 2015 Ram 3500 uses an electric or electric-hydraulic power steering system that does not have a traditional hydraulic fluid reservoir to be checked or filled.

Washer Fluid

Use any commercial windshield washer fluid. For cold climates, select a fluid with an appropriate freeze protection rating.

Diesel Exhaust Fluid (DEF) - 6.7L Cummins Only

If your truck is equipped with the 6.7L Cummins, it requires Diesel Exhaust Fluid (DEF) to meet emissions standards. Use only high-quality DEF that is API Certified and meets ISO 22241 specifications. The DEF tank holds approximately 5.5 gallons.

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