6.4 Hemi Oil Capacity, Filter Specs & Service Interval Guide

Quick Answer

The 6.4 Hemi holds 7 quarts (6.6 liters) of oil with a filter change. Stellantis specifies 5W-20 full synthetic meeting FCA Material Standard MS-6395. Pennzoil Ultra Platinum and Mobil 1 5W-20 both qualify. The factory filter is a Mopar MO-090. Drain plug torque is 20 ft-lb. Service every 5,000 miles under tow or severe duty, up to 7,500-8,000 miles for normal highway use.

6.4 Hemi Oil Capacity by Vehicle and Model Year

The 392 cubic-inch engine holds 7 quarts with a fresh filter. That's 6.6 liters in metric. Whether it powers a Ram 2500, Grand Cherokee SRT, or Challenger 392, the spec stays the same. Stellantis kept the oil pan design uniform across all platforms, which simplifies parts ordering and eliminates guesswork at the counter.

Forum veterans confirm it: "It's seven quarts. Pour six and a half, check the stick, top it off." That's exactly right. No model year throws a curveball.

Platform	Years	Oil Capacity (with filter)	Viscosity
Ram 2500 / 3500	2014-2025	7 qt (6.6 L)	5W-20 synthetic
Jeep Grand Cherokee SRT	2012-2022	7 qt (6.6 L)	5W-20 synthetic
Dodge Challenger SRT 392	2011-2023	7 qt (6.6 L)	5W-20 synthetic
Dodge Charger SRT 392	2012-2023	7 qt (6.6 L)	5W-20 synthetic
Dodge Durango SRT	2018-2021	7 qt (6.6 L)	5W-20 synthetic

Use this chart to confirm your platform before buying oil. There's no exception within the 6.4 family. If a post claims a 2018 Ram needs eight quarts, scroll past.

Correct Oil Type and Viscosity for the 6.4 Hemi

Stellantis spec is 5W-20 full synthetic meeting FCA Material Standard MS-6395. That's not optional. Oils that don't meet MS-6395 fall outside the powertrain warranty. The 6.4 is sensitive to viscosity changes. Going off-spec shows up in cold-start ticking and oil pressure readings.

Three oils that clearly meet the spec:

• Pennzoil Ultra Platinum 5W-20
• Mobil 1 Full Synthetic 5W-20
• Valvoline Advanced Full Synthetic 5W-20

You'll find forum debates pushing 5W-30 "for added film strength" or 0W-40 "because track packages use it." Track-pack SRTs have their own manual callouts. For a stock engine in a Ram, Grand Cherokee SRT, or 392 muscle car on the street, the answer is 5W-20.

Why not bump to 5W-30? The engine uses tight bearing clearances and an oil pump tuned for lighter weight. Run 5W-30 and you'll see higher pressure at idle, slower oil flow to the lifters on cold mornings, and a measurable drop in fuel economy. Anyone chasing "more cushion" with thicker oil is solving a problem that doesn't exist.

Oil Filter Specs and Recommended Replacements

Factory part is the Mopar MO-090. Thread size is 22mm x 1.5, and it ships with an anti-drain-back valve. This valve matters on this engine more than most. The element sits at an angle that lets oil drain back into the pan overnight if the valve fails. That's where the cold-start lifter tick comes from on day two of a botched swap.

Solid aftermarket equivalents:

• Wix 57356
• Purolator PL14610
• Fram Ultra Synthetic XG10060
• K&N HP-7022

Torque the element hand-tight, then add three-quarter turn with a wrench. That works out to roughly 20 ft-lb. Don't over-tighten with a strap wrench. Over-torqued elements crush the gasket and leak the next morning.

Drain Plug Torque and Oil Pan Details

Drain plug torque is 20 ft-lb (27 N·m). Thread size is M14 x 1.5. Replace the crush washer every change. They cost about thirty cents and stop the slow seep that makes you wonder if the gasket is failing.

A 15mm socket fits the plug head. Snug it, click the torque wrench, walk away. Cross-threading the pan is a $400 mistake on this engine because the pan is aluminum on most applications. Go slow on the first two turns by hand.

Don't overfill. The dipstick reads notoriously tight between the ADD and FULL marks. The difference is roughly half a quart. Past the FULL mark, you'll aerate the oil and watch pressure dip at hot idle.

6.4 Hemi Oil Change Interval: Factory Schedule vs. Real-World Use

The factory oil life monitor is the headline answer, but it's not the whole picture. Depending on how you drive, the monitor can trigger anywhere from 5,000 to 10,000 miles. That's a 5,000-mile spread. "Follow the monitor" isn't enough guidance for an enthusiast.

What the Oil Life Monitor Actually Measures

The algorithm isn't sampling the oil. It pulls cold-start counts, RPM hours, engine temp data, and fuel-trim figures. It's smart, but it doesn't know if you ran the truck loaded across the Eisenhower grade last weekend. It also doesn't know if you live in Phoenix and your oil sat at 250°F for a week of summer commuting.

Severe-Duty Driving: When to Go Shorter

Stellantis defines severe duty in plain terms: frequent towing, trailer use, off-road driving, repeated short trips under 10 miles, extended idling, or sustained operation in extreme temperatures. Hit any one of those regularly and you're a severe-duty user. Change interval drops to 5,000 miles or 6 months, whichever comes first.

For pure highway driving with light loads, 7,500-8,000 miles is the real-world sweet spot. Some owners run their Grand Cherokee SRTs to 10,000 on the monitor and the oil analysis comes back clean. That's the ceiling, not the target.

Step-by-Step DIY Oil Change on the 6.4 Hemi

Two-hour job in the driveway, including the parts run if you forgot a crush washer.

Tools and Supplies You Need

• 15mm socket and 3/8" ratchet
• Oil element wrench (cap-style preferred on the MO-090)
• 8-quart drain pan
• Funnel
• Torque wrench (10-50 ft-lb range)
• Crush washer (M14)
• 7 quarts of 5W-20 full synthetic
• Mopar MO-090 element or equivalent
• Nitrile gloves and shop rags

Drain, Replace Element, Refill

Start the engine and let it run 2-3 minutes. Warm oil drains faster and pulls more contaminants. Don't let it reach full operating temp or you'll burn your forearm on the exhaust manifold.

Pull the drain plug. Let it run for at least 10 minutes. While it drains, twist the element off. It's on the passenger side of the engine, accessed easiest from underneath. Wipe the mating surface and smear fresh oil on the new element's gasket. Hand-thread it, then three-quarter turn with the wrench.

Re-install the drain plug with a new crush washer at 20 ft-lb. Pour in 6.5 quarts. Run the engine 30 seconds. Shut it off and wait two minutes. Check the dipstick. Top off to the FULL mark. You'll usually need the last half quart but not always.

Reset the oil life monitor: turn the key to ON without starting. Press the gas pedal to the floor three times within 10 seconds. Turn off. Done.

Protecting the Cab While You Protect the Engine

Here's the part nobody mentions in oil-change videos. You just spent two hours under the truck. Your gloves are soaked. There's a black smudge running up your forearm. You've got to drive the Ram to AutoZone to drop off the used oil. You climb in. Your work pants slide across the factory cloth. Maybe you tossed a shop rag on the seat first. Maybe you didn't.

That's how cloth seats die. Not in one event, but in a hundred small ones. Oil dust from a brake job. A coffee spill on the way back from the parts counter. The dog jumping in after a swim at the river. The same mindset that has you doing your own oil change should have you protecting your seats. Check out the made-to-fit seat covers for cars and trucks that Seat Cover Solutions builds for the same year-make-model platforms running the 6.4 Hemi. Airbag-safe, vehicle-specific, install in under an hour with no tools. They pull off the same energy as the oil change you just finished.

Common 6.4 Hemi Oil Questions and Fixes

A few things every 6.4 owner runs into eventually.

Oil consumption. The engine burns some oil. Stellantis considers up to 1 quart per 2,000 miles acceptable under heavy use. That sounds aggressive but it's consistent with what most owners report. Check your level every other fill-up if you tow or run the engine hard.

Oil pressure warning light. If it kicks on at idle when hot, first check the level. The second culprit is a stuck oil pressure sensor on the back of the block. This is a known wear item on this engine. Don't ignore it, but don't panic either.

Lifter tick after an oil change. Air in the lifters from element swap usually clears in 5-10 minutes of driving. If it persists past a day, you may have an element without a working anti-drain-back valve.

0W-20 instead of 5W-20. Stellantis does not approve 0W-20 for the 6.4. Stay with 5W-20.

Frequently Asked Questions

Q: What oil does a 392 6.4 Hemi take?

The 392 (which is the 6.4 Hemi by displacement) takes 5W-20 full synthetic meeting FCA Material Standard MS-6395. Pennzoil Ultra Platinum 5W-20, Mobil 1 5W-20 Full Synthetic, and Valvoline Advanced Full Synthetic 5W-20 all meet the spec. Volume is 7 quarts with an element change across every application, from the Ram 2500 to the Challenger 392.

Q: How many quarts of oil does a 6.4 Hemi hold?

Seven quarts (6.6 liters) with an element change. Pour 6.5 quarts first, run the engine for 30 seconds, then check the dipstick. Top off to the FULL mark with the remaining oil. Don't overfill past FULL because excess oil aerates and causes pressure loss at hot idle, which can also trigger lifter noise.

Q: What is the oil change interval for a 6.4 Hemi?

The factory oil life monitor triggers somewhere between 5,000 and 10,000 miles based on driving conditions. For towing, hauling, off-road use, or frequent short trips, stay at 5,000 miles or 6 months. Normal highway driving with light loads can safely stretch to 7,500-8,000 miles. Anyone pushing past 10,000 should pull an oil sample and have it analyzed first.

Q: Can I use 5W-30 in a 6.4 Hemi?

Stellantis specifies 5W-20 for the 6.4 Hemi across all model years. Running 5W-30 isn't the end of the world mechanically, but it falls outside the MS-6395 spec and can affect powertrain warranty coverage on newer trucks. You'll also see slightly slower cold-start oil flow and a small fuel economy hit. Stay with 5W-20 synthetic.

Q: What oil filter fits a 6.4 Hemi?

The factory element is the Mopar MO-090. Aftermarket equivalents include the Wix 57356, Purolator PL14610, Fram Ultra Synthetic XG10060, and K&N HP-7022. All use the same 22mm x 1.5 thread and include an anti-drain-back valve. Skip cheap economy elements on this engine because the element sits at an angle where a weak drain-back valve causes cold-start lifter tick.

Q: Is it normal for a 6.4 Hemi to burn oil?

Yes, within reason. Stellantis considers up to 1 quart per 2,000 miles acceptable under heavy use. Check your level every other fill-up if you tow, drive hard, or live in hot climates. Consumption beyond that range (say, a quart every 1,000 miles) warrants a look at valve seals, PCV function, or piston rings.

You just put the right oil in the engine. Now put the right cover on the seat with OEM-style luxury seat covers built for daily work use. Same enthusiast mindset, same hour in the driveway, lasting protection for the cab you spend every day in.