Ram 2500 Oil Type and Capacity Guide by Engine (2011–2026)

The Ram 2500 has carried three different engines under its hood since 2011, and each one calls for a different oil specification. Owners and shoppers researching the right oil for a heavy-duty Ram run into the same problem repeatedly: information published for the Ram 1500 or for SRT performance cars gets misapplied to the 2500’s heavy-duty engines, and the wrong viscosity or quantity can cause real damage — accelerated wear, voided warranty coverage, or in the case of the 2019-and-newer Cummins, immediate harm to hydraulic engine components.

This guide breaks down the Mopar-specified oil type, capacity, and material standard for each of the three engines that powered the Ram 2500 from 2011 through 2026. Everything below is sourced from the official Stellantis owner’s manual and Stellantis Technical Service Bulletin 09-013-23. For drivers in Ontario, Corona, Norco, and Claremont, this reference covers any Ram 2500 you’re likely to be servicing.

Quick-Reference Spec Table

The full Ram 2500 oil spec matrix from 2011 through 2026, organized by engine and year. Detailed engine-by-engine breakdowns follow below.

The Three Engines Used in the Ram 2500 (2011–2026)

Three engines have powered the Ram 2500 across this span:

• The 5.7L HEMI V8 — the standard gasoline engine from 2011 through 2018
• The 6.4L HEMI V8 — introduced in 2014 as a premium gasoline option and the sole gasoline engine from 2019 onward
• The 6.7L Cummins Turbo Diesel — available continuously since the engine’s debut, with major service-relevant updates in 2019 (new hydraulic-lifter valvetrain) and 2025 (redesigned block, head, and turbocharger)

Each engine has its own oil capacity, viscosity requirement, and Mopar material standard. They are not interchangeable, and using the spec from one engine on another is one of the most common service errors at independent shops.

5.7L HEMI V8 (2011–2018)

The 5.7L HEMI in the Ram 2500 shares its engine block with the Ram 1500, but the heavy-duty application calls for a different oil viscosity. Where Ram 1500 owners are familiar with the 5W-20 spec, the 2500/3500 owner’s manual explicitly calls out the difference: for trucks operating under a gross combined weight rating of 14,000 pounds or greater, SAE 5W-30 is the recommended viscosity for all operating temperatures.

This isn’t optional or a “for severe duty” footnote. The HD spec exists because heavy-duty applications generate more heat and load, and 5W-30 provides the additional film strength needed for sustained towing and hauling. Owners servicing a used 5.7L Ram 2500 should default to the 5W-30 spec rather than the 5W-20 spec common to gasoline Ram 1500s.

The Multi-Displacement System (MDS) on the 5.7L HEMI requires synthetic oil to function correctly — conventional or synthetic blend oils are not approved substitutes.

6.4L HEMI V8 (2014–2026)

The 6.4L HEMI V8 — sometimes called the “Apache” engine to distinguish it from the SRT-tuned 6.4L used in Dodge performance cars — joined the Ram 2500 lineup for the 2014 model year and became the only gasoline option starting with the 2019 redesign. Its oil requirements catch many owners off guard.

The 6.4L HEMI in the Ram 2500 uses SAE 0W-40 full synthetic — not 5W-20, not 5W-30, and not the same 0W-40 used in Charger or Challenger SRT models. The Mopar owner’s manual specifies an oil meeting material standard MS-A0921 (for 2022 and newer trucks) or MS-12633 (for 2014–2021 trucks). The widely available oil that meets this spec is Pennzoil Ultra Platinum 0W-40 — the brand Stellantis explicitly references in the manual. Mopar-branded 0W-40 also meets the spec.

A few important clarifications about the 6.4L HEMI in the Ram 2500:

• It is naturally aspirated. There is no turbocharger on this engine. Any oil discussion involving turbo bearings applies only to the diesel engine, not the 6.4.
• The 0W-40 spec is year-round in any climate. The “0W” prefix refers to cold-temperature pumpability, but the 40-weight operating viscosity is what the engine’s bearings, hydraulic lifters, and Multi-Displacement System are designed around. There is no separate warm-climate viscosity.
• Substituting a lighter viscosity (such as 5W-20 or 0W-20 from a Ram 1500 spec sheet) is not authorized and will not provide adequate film strength under load.

6.7L Cummins Turbo Diesel (2011–2026)

The 6.7L Cummins inline-six turbo diesel has been continuously available in the Ram 2500 since the engine debuted in 2007.5. The 12-quart oil capacity has remained consistent across every model year through 2026. Viscosity guidance, however, changed substantially in 2019, and the change is critical for any owner servicing a Cummins-powered Ram.

2011–2018 (Pre-Hydraulic-Lifter Cummins)

For 2011–2018 Ram 2500 trucks with the 6.7L Cummins, 15W-40 is the standard recommendation for the Inland Empire climate. The 5W-40 synthetic option is available year-round and is preferred by many owners for its superior cold-start performance, even in moderate climates — it provides the same operating viscosity as 15W-40 but flows more readily at lower temperatures.

2019–2026 (Hydraulic Lifter Cummins)

Starting with the 2019 model year, the 6.7L Cummins received a redesigned valvetrain incorporating hydraulic lifters. This change made the engine sensitive to oil viscosity in a new way.

Critical warning per Stellantis Technical Service Bulletin 09-013-23 (issued July 2023): 15W-40 oil cannot be used in any 2019-or-newer 6.7L Cummins engine. The TSB states explicitly: “15W-40 grade oil CAN NOT be used in any 2019 model year or newer 6.7L equipped vehicles due to the new designed valve train of this engine. If this oil is used, it will cause deposits to form in the Hydraulic Valve Lash Adjusters leading to undesirable noise, and/or engine damage.”

This year-of-build distinction matters even if the truck is being serviced thousands of miles from where it was originally sold. The 2019 redesign retained the same 6.7L displacement and 12-quart capacity, but the internal architecture changed. If you’re servicing a Cummins-powered Ram 2500 and you don’t know the model year, check the oil fill cap — Stellantis prints the approved viscosities directly on the cap for 2019 and newer trucks.

The 2025 model year brought a further redesign of the 6.7L Cummins — new block, new head, new turbocharger, and an HO-only output spec rated at 430 horsepower and 1,075 lb-ft of torque. The oil requirements continued to follow the 2019+ guidance: 10W-30 standard, 5W-40 cold-climate or year-round option, MS-10902 and API CK-4 specification.

Why Oil Spec Compliance Matters

Using the wrong oil in a Ram 2500 isn’t a minor issue. For warranty coverage, Stellantis requires that all maintenance be performed using oils meeting the specified material standards — MS-6395, MS-A0921, MS-12633, or MS-10902 depending on engine and year. Documentation matters: oil receipts and service records demonstrate compliance if a warranty claim is reviewed.

Beyond warranty, the consequences of wrong-spec oil show up in real engine wear. The 6.4L HEMI’s Multi-Displacement System depends on the 0W-40’s specific flow characteristics to cycle cylinders correctly. The 2019-and-newer 6.7L Cummins’s hydraulic lifters depend on the 10W-30 or 5W-40 viscosity to deliver consistent valve actuation — running 15W-40 in these engines, per Stellantis itself, will cause deposits and damage. Even on the older 5.7L HEMI, running the lighter 5W-20 spec from the 1500 in a heavily towed 2500 results in accelerated bearing and lifter wear over time.

Summer heat across Ontario, Corona, Norco, and Claremont — combined with sustained towing duty common among Ram 2500 owners in the Inland Empire — makes spec compliance even more important. The oil specifications were engineered around heat tolerance, load duty, and engine architecture. Substitutions designed for lighter applications don’t translate to a heavy-duty truck.

Schedule Service at Jeep Chrysler Dodge RAM FIAT of Ontario

The service center at Jeep Chrysler Dodge RAM FIAT of Ontario stocks Mopar oil and filters matched to every Ram 2500 engine specification, including the harder-to-source MS-A0921 0W-40 for the 6.4L HEMI and the API CK-4 10W-30 required for 2019-and-newer Cummins engines. Certified technicians service every Ram 2500 model year covered in this guide, from 2011 through 2026, using the correct specification for your specific engine and build year.

Important Note: The information in this article reflects Stellantis published guidance current to the date of publication and is provided for general reference purposes only. Vehicle specifications, fluid requirements, and material standards may be updated by Stellantis at any time via technical service bulletins, owner’s manual revisions, or other official channels. Always confirm the correct oil type, capacity, and any other service-related specification against your specific vehicle’s owner’s manual or the engine oil fill cap before performing service or purchasing supplies. For questions about your specific Ram 2500 or to confirm the current Mopar-approved specification for your model year and engine, contact the Jeep Chrysler Dodge RAM FIAT of Ontario service team at 909-321-9772 or schedule a service appointment online.