2015 Ram ProMaster Fluid Specifications and Capacities

As an ASE-certified master technician, I’ve seen firsthand how using the wrong fluids can quickly turn a reliable commercial workhorse into a frustrating money pit. The 2015 Ram ProMaster is a unique beast in the North American market, largely based on the European Fiat Ducato. Because of its European roots and specialized powertrains—the 3.6L Pentastar V6 gas engine and the 3.0L EcoDiesel I4—its fluid requirements are highly specific.

Whether you manage a fleet of delivery vans or are converting one into a camper, strict adherence to OEM Mopar specifications is non-negotiable. Below is a comprehensive fluid guide for the 2015 Ram ProMaster to keep your van on the road and out of the shop.

Quick reference

Fluid	Type/Spec	Capacity
Engine Oil (3.6L V6 Gas)	5W-20 API SN / Chrysler MS-6395	6.0 Quarts (5.6 L)
Engine Oil (3.0L Diesel)	5W-30 Synthetic ACEA C3 / Chrysler MS-11106	9.5 Quarts (9.0 L)
Engine Coolant	Mopar 10-Year/150k OAT (Purple) / MS-12106	3.6L: 10.5 Qts | 3.0L: 12.5 Qts
Transmission (3.6L V6)	Mopar ATF+4 / MS-9602	5.8 Qts (Service Fill)
Transmission (3.0L Diesel)	Mopar C-Series Manual Trans Fluid / MS-9224	~2.5 Qts (Verify in service info)
Brake Fluid	Mopar DOT 4 Brake Fluid / MS-90039	Fill to MAX line
Power Steering Fluid	Pentosin CHF 11S / Mopar MS-11655	Fill to MAX line
DEF (3.0L Diesel only)	Diesel Exhaust Fluid / ISO 22241	5.0 Gallons
Washer Fluid	Standard windshield washer fluid	1 Gallon

Note: The Ram ProMaster is a front-wheel-drive (FWD) vehicle. There is no transfer case or rear differential to service.

Engine Oil Specifications and Advice

3.6L Pentastar V6 (Gasoline)

For the 3.6L V6, Ram specifies 5W-20 engine oil that meets API Certified (SN or newer) and Chrysler Material Standard MS-6395. This is a very common standard, but don't just grab the cheapest conventional oil on the shelf. Given the severe duty cycles these vans often see (heavy payloads, excessive idling), a high-quality full synthetic is highly recommended. Interval: Follow the Oil Life Indicator, but do not exceed 10,000 miles or 12 months under any circumstances. Fleet operators doing city routes should target 5,000-mile intervals.

3.0L EcoDiesel I4

The 3.0L EcoDiesel requires a very specific low-ash oil to protect the Diesel Particulate Filter (DPF). You must use a 5W-30 full synthetic oil meeting ACEA C3 and Chrysler MS-11106 specifications. Pitfall: Never use heavy-duty diesel oils like 15W-40 CK-4 in this engine. Using oil that does not meet the low-ash MS-11106 spec will quickly clog the DPF, leading to a catastrophic loss of power and a repair bill in the thousands.

Engine Coolant (OAT)

Both engines require Mopar Antifreeze/Coolant 10 Year/150,000 Mile Formula OAT (Organic Additive Technology), which meets Chrysler spec MS-12106. From the factory, this coolant is purple.

Major Pitfall: Do not mix this OAT coolant with the older Chrysler HOAT (Hybrid Organic Additive Technology) coolant, which is typically orange/pink. Mixing OAT and HOAT creates a thick sludge that will plug the heater core, radiator, and engine water jackets, leading to severe overheating and engine failure. Never use "universal" green coolants either. If you are topping off, use only MS-12106 approved OAT coolant mixed 50/50 with distilled water.

Transmission Fluid

62TE 6-Speed Automatic (3.6L V6)

The 3.6L V6 is mated to the 62TE transaxle. This requires Mopar ATF+4 (Chrysler spec MS-9602). ATF+4 is a highly friction-modified synthetic fluid. Advice: Never use Dexron/Mercon or "multi-vehicle" ATFs. The 62TE is highly sensitive to fluid friction characteristics. Using the wrong fluid will result in harsh shifting, shuddering, and premature clutch failure. A pan drop and filter change every 60,000 miles is best practice for heavy commercial use.

M40 Automated Manual (3.0L Diesel)

The diesel engine uses a unique M40 6-speed automated manual transmission. The gearset itself requires Mopar C-Series Manual & Automated Manual Transmission Fluid (Chrysler spec MS-9224). Keep in mind that the hydraulic actuation unit for this transmission requires its own specialized hydraulic fluid (often Pentosin CS-Speed or OEM equivalent). Always consult the OEM service manual before servicing the automated manual hydraulics.

Brake Fluid

The 2015 Ram ProMaster requires DOT 4 Brake Fluid (Chrysler spec MS-90039). Because these vans carry immense weight, the braking system gets incredibly hot. DOT 4 has a higher boiling point than DOT 3.

Interval: Brake fluid is hygroscopic (it absorbs moisture from the air). Flushing the brake fluid every 2 years or 30,000 miles is critical to prevent a spongy pedal and internal corrosion of the ABS module and brake calipers. Never substitute DOT 5 (silicone), as it will destroy the ABS system.

Power Steering Fluid

Because of its European roots, the ProMaster uses a specialized hydraulic power steering system that requires Pentosin CHF 11S (or Mopar equivalent meeting MS-11655). Pitfall: Do not pour standard red power steering fluid or ATF into this reservoir! Standard ATF will swell and destroy the seals in the steering rack and pump, resulting in an expensive rack and pinion replacement. CHF 11S is a green, high-performance synthetic hydraulic fluid.

Diesel Exhaust Fluid (DEF)

If you have the 3.0L EcoDiesel, you must maintain the Diesel Exhaust Fluid system. The system requires DEF meeting the ISO 22241 standard (often marked as API Certified DEF). The tank holds 5 gallons. Advice: DEF degrades over time, especially in extreme heat or direct sunlight. If you don't drive the van often, don't fill the tank to the brim, as old DEF can crystallize and damage the DEF pump and injector. If the DEF warning light comes on, do not ignore it—the vehicle will eventually go into a severe limp mode or refuse to start.

Windshield Washer Fluid

Any standard windshield washer fluid will work. In colder climates, ensure you are using a winter blend rated for at least -20°F to prevent the fluid reservoir and lines from freezing and cracking.

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Proper fluid maintenance is the lifeblood of your commercial vehicle. Cutting corners on fluid specs might save a few dollars today, but it will cost you your livelihood tomorrow. Find a trusted shop on Repairius.