Ram 2500 Oil Capacity by Engine & Year (2026 Reference Guide)

You're standing in the driveway with a fresh jug of 5W-40 and a drain pan already under the frame. The 2500 is warmed up, filter's off, and now you're squinting at the back of the jug wondering if six quarts is enough or if you need to crack a second one. Depends entirely on what's under the hood. The 6.7L Cummins takes almost twice what the 6.4L HEMI takes. Guess wrong and you're either short a quart or watching oil creep past the full mark. This guide gives you the exact fill for every Ram 2500 engine, sorted by year.

Ram 2500 oil capacity depends on the engine. The 6.4L HEMI V8 takes 7 quarts (6.6L) of 5W-20 full synthetic. The 6.7L Cummins turbo diesel takes 12 quarts (11.4L) of 10W-30 or 15W-40 rated API CJ-4/CK-4. The older 5.7L HEMI (2003 to 2013) also takes 7 quarts of 5W-20. All numbers include the oil filter. Always verify against your owner's manual for the exact model year.

Ram 2500 Oil Capacity at a Glance: Full Chart by Engine and Year

Three engines have powered the Ram 2500 across the modern era. Two gas HEMIs and one very thirsty Cummins. The HEMIs both hold 7 quarts. The Cummins holds nearly double that. Here's the whole picture in one chart, cross-referenced with what the Ram spec page publishes and what most Cummins owners confirm on forums.

Engine	Years Available	Oil Capacity (with filter)	Recommended Viscosity	Oil Standard
5.7L HEMI V8 (gas)	2003 to 2013	7 qt (6.6 L)	5W-20 full synthetic	API SN or newer
6.4L HEMI V8 (gas)	2014 to 2026	7 qt (6.6 L)	5W-20 full synthetic	API SN or newer
6.7L Cummins I-6 (diesel)	2007 to 2026	12 qt (11.4 L)	10W-30 or 15W-40	API CJ-4 or CK-4

A few things worth flagging before you start pouring. Every number above assumes you're changing the filter at the same time (which you should be). If you skip the filter, drop about half a quart. Also, the capacity is what the sump holds when filled to the dipstick "full" mark, not what drained out. Some HEMI blocks retain a bit of oil in the galleries, so verify on the stick before topping off.

If you own a 2024 or 2025 truck, the covers, fitment guides, and spec-lookup pages differ from the pre-2019 fifth-gen body. Same engines, different cabins. That matters when you shop seat covers for a 2024 Ram 2500 or a 2025 truck later on.

6.4L HEMI V8 Oil Capacity (2014-2026)

The 6.4L HEMI (also called the 392) replaced the 5.7L in the 2500/3500 lineup in 2014. Same 7-quart fill as the outgoing 5.7, but Stellantis tightened the viscosity spec.

Capacity: 7 quarts (6.6 L) with filter.

Recommended oil: 5W-20 full synthetic, API SN or newer.

Some owners try to run 5W-30 in hotter southern states, reasoning the thicker oil handles Phoenix asphalt better. The problem is the MDS (Multi-Displacement System) lifters are designed around the flow characteristics of 5W-20. Run something too thick and you can get lifter noise, lifter tick, or in the worst case, collapsed lifters. Stick with 5W-20.

Oil change interval on the 6.4L HEMI with full synthetic is up to 8,000 miles under normal use. If you're running conventional or a synthetic blend, cut that to 3,000 to 5,000 miles. Tow heavy? Cut it again. A guy I know runs a landscaping crew and changes his 6.4 every 4,000 miles because half his days are spent idling with a loaded trailer behind him.

For anyone in that situation, the Ram 2500 luxury seat covers hold up better than the factory cloth once mulch and mud become part of the daily routine.

6.7L Cummins Diesel Oil Capacity (2007-2026)

The 6.7L Cummins is the reason a lot of folks buy a 2500 in the first place. It's also the reason your oil bill is higher. This engine holds 12 quarts. That's not a typo.

Capacity: 12 quarts (11.4 L) with filter.

Recommended oil: 10W-30 or 15W-40, API CJ-4 or CK-4 rated.

Why so much? Two reasons. First, the sump is huge because the crankshaft on an inline-six diesel is longer than a V8's, and the block itself is deeper. Second, that turbocharger runs hot and needs a steady oil supply to keep the bearings alive. More oil in the system means more thermal mass, slower breakdown, longer service life.

Early 6.7L Cummins (2007-2012): Capacity and Spec

The first-gen 6.7L Cummins arrived in the 2007.5 model year, replacing the 5.9L. Capacity was 12 quarts from day one. Owners in this range often report seeing 13 quarts drain out if the truck sat overnight on level ground. That extra bit is oil that pooled in the head and drained down slowly. Fill to 12, run it, check the stick.

Updated 6.7L Cummins (2013-2026): Capacity and Spec

The 2013-and-up 6.7L got a redesigned oil pan, a stronger crank, and revised turbo plumbing. Capacity stayed at 12 quarts. What did change is the recommended oil standard. Older CJ-4 oils are fine, but Cummins now steers you toward CK-4 for the newer engines because of tighter emissions controls and the DPF regen cycle. Use the wrong oil (say, a passenger-car formulation without the CK-4 rating) and you can gum up the DPF fast.

A 2018 2500 Laramie owner on a Cummins forum put it plainly: "Ran conventional 15W-40 for two changes on my HD. It works, but full synthetic 5W-40 got me another 5,000 miles per interval and the turbo runs quieter cold."

5.7L HEMI V8 Oil Capacity (2003-2013)

The 5.7L HEMI powered the gas Ram 2500 from 2003 until the 6.4L took over in 2014.

Capacity: 7 quarts with filter.

Recommended oil: 5W-20.

Same fill as the 6.4L, same viscosity. The 5.7 is a lower-output engine (around 383 hp in later years) and less thermally stressed than the 392, but the oil spec is identical. If you own a 2010 or 2012 2500 with the 5.7, don't overthink it. Seven quarts of 5W-20 synthetic and you're done.

One note: pre-2011 5.7 HEMIs are known for lifter tick when oil gets old. Change it on time. The engine will tell you when it wants fresh oil, and it's not subtle.

Choosing the Right Oil Type for Your Ram 2500

Full synthetic is the right call on all three engines. It costs more up front, but the extended interval pays it back on the second change. Synthetic blend works. Conventional works too, but you're changing it twice as often.

For the Cummins specifically, do not use passenger-car motor oil. Even if the viscosity looks right (say, a 5W-30 that's rated for gas engines), it doesn't have the additive package to handle diesel soot loading. You'll see your oil turn black in 500 miles and the additives are done. Diesel-rated oil (API CJ-4 or CK-4) has the detergent load to keep soot suspended so the filter can catch it.

Climate matters too. Running a 2500 in Fairbanks in January? A 5W-40 full synthetic diesel oil starts easier than a 15W-40. Running in Yuma in July with a gooseneck? 15W-40 gives you better film strength at high temps.

If your truck sees hot summers and cold winters, your VIN plate and door jamb hold the answers on trim and equipment codes. This guide on how to find your Ram trim and color code walks through where to look. Using the wrong oil or skipping the CK-4 rating on the Cummins can affect powertrain warranty coverage, so keep receipts.

Oil Change Intervals for the Ram 2500

Here's what the manuals and real-world owners agree on:

• 6.4L HEMI (gas): 8,000 miles with full synthetic under normal use. 3,000 to 5,000 with conventional.
• 5.7L HEMI (gas): Same as the 6.4. 8,000 miles synthetic, 3,000 to 5,000 conventional.
• 6.7L Cummins (diesel): Up to 15,000 miles with full synthetic CK-4 diesel oil under normal driving.

Severe-duty conditions cut all those numbers roughly in half. Severe duty means towing more than 50% of the time, off-road use, extended idling, dusty environments, or short trips where the engine doesn't reach full operating temp. If any of that sounds like your truck, halve the interval.

The Ram oil life monitoring system is a decent guide. It watches load, RPM, temp, and idle time to estimate remaining oil life. Trust it directionally, but don't ignore mileage. If the OLM says 40% and you're at 12,000 miles on a Cummins, change it anyway. The sensor doesn't know how dirty the oil actually is.

What Happens If You Overfill or Underfill the Ram 2500

Overfilling is worse than most people think. If you pour 8 quarts into the 6.4 HEMI thinking you'll be safe, the crankshaft counterweights start whipping the oil into foam. Foamed oil doesn't lubricate. Bearings starve. On the diesel, an overfill can push oil past the turbo seals and into the intake tract, where it can cause a runaway condition. That's a rebuild.

Underfill is bad in a different way. Under hard acceleration or on a steep grade with a trailer behind you, oil sloshes to the back of the pan. If you're already low, the pickup tube sucks air. A few seconds of that and you've cooked a rod bearing.

How to check it right: park on level ground, engine off, wait five minutes for the oil to settle back to the pan, then pull the dipstick. Wipe it, reinsert fully, pull again, read. The reading should sit between the two marks. If it's at the low mark, add half a quart. Check again. Half-quart increments keep you from overshooting.

Keeping Your Ram 2500 in Shape Beyond the Oil Change

While you've got the truck up and warm, check the coolant reservoir, brake fluid, and the transmission dipstick if you've got the Aisin. Five minutes of extra work saves a tow bill later.

One thing owners forget: the interior wears out just as fast as the drivetrain. A work 2500 that sees job sites, tow rigs, and muddy boots ends up with cracked bolsters and ground-in grime by year three. The factory cloth on a Tradesman or the leather on a Laramie both give up faster than most owners expect. That's where custom truck seat covers for work and daily use earn their keep. Vehicle-specific patterns cut for every seat position, airbag-safe, installed in under an hour.

If you're specifically on a 2026 truck, the 2026 Ram 2500 seat covers match the new cabin layout exactly. On an older body, the OEM-style seat covers for the Dodge Ram 2500 walk through the fitment differences by year. The Seat Cover Solutions luxury seat covers page shows all the material and color options.

Frequently Asked Questions

Q: How many quarts of oil does a Ram 2500 take?

Depends on the engine. The 6.4L HEMI V8 and the older 5.7L HEMI V8 both take 7 quarts (6.6 liters) with a filter change. The 6.7L Cummins turbo diesel takes 12 quarts (11.4 liters). Always fill to about a quart short of spec, run the engine briefly, then top off based on the dipstick reading. Cold-fill numbers can vary slightly depending on how much oil stayed in the galleries.

Q: What oil does a Ram 2500 6.7 Cummins take?

The 6.7L Cummins requires a diesel-rated oil meeting API CJ-4 or CK-4 standards. Viscosity is typically 10W-30 or 15W-40 depending on climate. Cold-weather owners often step down to a 5W-40 full synthetic for easier cranking. Do not use passenger-car gas engine oil in the Cummins, even if the viscosity looks right. The additive package is wrong and you'll load up the DPF fast.

Q: What oil does a Ram 2500 6.4 HEMI take?

Stellantis specifies 5W-20 full synthetic for the 6.4L HEMI, meeting API SN or newer standards. Capacity is 7 quarts including a fresh filter. The 5W-20 spec is tied to the MDS lifter design and the variable valve timing system. Running a thicker oil like 5W-30 can cause lifter tick and, over time, damage to the MDS components. Save the heavy oil for the diesel.

Q: How often should I change the oil on a Ram 2500 diesel?

Under normal driving with full synthetic CK-4 diesel oil, the 6.7L Cummins can go up to 15,000 miles between changes. Severe-duty use (heavy towing, dusty job sites, lots of idling, short trips) cuts that in half, roughly 7,000 to 8,000 miles. Use the Ram oil life monitor as a guide but cross-check against the odometer. If you tow more than half the time, treat every trip as severe duty.

Q: Can I use 5W-30 instead of 5W-20 in my Ram 2500 HEMI?

Stellantis specifies 5W-20 for both the 5.7L and 6.4L HEMI. Running 5W-30 for one short interval in a pinch won't destroy anything, but it's not the factory spec. Long-term use of 5W-30 in a HEMI can affect MDS lifter operation, fuel economy, and cold-start behavior. It can also give the dealer a reason to push back on a warranty claim. Stick with 5W-20.

Q: Does the Ram 2500 have an oil life monitor?

Yes. Every modern Ram 2500 has an oil life monitoring system that tracks engine load, RPM, temperature, and idle time to estimate remaining oil life. When the percentage drops to zero, the dash prompts you to change the oil. It's a good guide, especially for mixed-use trucks. But don't ignore the odometer. On a Cummins pulling a fifth-wheel every weekend, the sensor can underestimate wear.

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