2020 Ram 3500 Oil Capacity 2026 Quick Reference
Quick Answer
The 2020-2026 Ram 3500 oil capacity varies significantly by engine: the 6.4L HEMI V8 requires 7 quarts (6.6L) of 0W-40, while the 6.7L Cummins Turbo Diesel requires 12 quarts (11.4L) of 15W-40 or 5W-40. Always include the filter during capacity calculations, as filling to the dry capacity without accounting for the filter volume will lead to an overfilled crankcase.
Performing your own oil change is the most effective way to ensure your 2020 Ram 3500 continues to deliver heavy-duty performance. Whether you are operating the 6.7L Cummins Turbo Diesel or the 6.4L HEMI V8, using the exact manufacturer-specified oil volume is critical. Incorrect oil levels—either underfilled or overfilled—can lead to severe engine damage, reduced fuel efficiency, and compromised durability under high-torque towing conditions. This guide provides the factory-backed oil capacity and viscosity specifications for your 2020 Ram 3500 to ensure every service interval is performed with absolute precision.
Prime for Young Adults — 6 Months Free
Students and 18–24s get six months of Prime free, then half price.
Start 6 Months Free
2020 Ram 3500 Oil Capacity and Recommended Oil Type Chart
Recommended Best Deal Products
This reference covers the 2020 Ram 3500 across all standard configurations. Always verify your specific engine code against the vehicle’s emission label and owner’s manual. Data current as of August 2026.
| Engine | Oil Capacity (w/ Filter) | Recommended Viscosity | Notes |
|---|---|---|---|
| 6.7L Cummins Turbo Diesel | 12 Quarts | 5W-40 (Synthetic) | API CK-4 Specification |
| 6.4L HEMI V8 | 7 Quarts | 0W-40 | MS-12633 Requirement |
Understanding Viscosity and API Certification
Selecting the correct oil involves more than just hitting the capacity target. For the 6.7L Cummins, the use of API CK-4 certified oil is mandatory to protect the diesel particulate filter (DPF) and turbocharger components. The 6.4L HEMI requires specific synthetic formulations that adhere to Chrysler’s MS-12633 material standard, ensuring the variable valve timing system operates reliably. Using generic oils that do not meet these standards can lead to premature sludge buildup or catastrophic bearing failure under high-load conditions.
Factors Influencing 2020 Ram 3500 Oil Capacity and Usage
The Role of the Oil Pan and Crankcase
The 6.7L Cummins engine utilizes a massive cast-aluminum oil pan designed to dissipate heat effectively during long-haul towing. This large volume—12 quarts—is essential for maintaining oil life despite the high soot levels inherent in diesel combustion. Conversely, the 6.4L HEMI uses a 7-quart system designed to manage the heat generated by its high-performance gasoline combustion. Each pan is precisely engineered to ensure the oil pump pick-up remains submerged, even during aggressive acceleration or steep inclines.
Why Engine Oil Viscosity Matters for Your 3500
Viscosity determines how your oil behaves at both start-up and operating temperatures. In extreme cold, a 0W-40 or 5W-40 synthetic ensures rapid flow to the cylinder head, preventing dry starts. During the high-heat, high-stress environments of towing, these synthetics maintain a robust lubricating film that protects critical rod and main bearings. Choosing a viscosity outside of the owner’s manual recommendations can cause the oil pressure sensor to trigger a warning or, in severe cases, cause internal engine component seizing.
Always account for the oil filter volume. The 6.7L Cummins filter is significant in size and will hold approximately 0.5 to 1 quart of the total capacity. Always “pre-fill” the new filter with clean oil to reduce the duration of the “oil-starved” period during the first few seconds of a post-change restart.
How to Properly Perform a 2020 Ram 3500 Oil Change
Recommended Best Deal Products
Ensure the engine is warm (but not scalding). Place a large enough catch basin—at least 15 quarts for the Cummins—under the pan. Remove the drain plug and allow it to drain fully until only a slow drip remains.
Remove the old filter, clean the mounting surface, and ensure the old gasket has not stuck to the engine block. Lubricate the new filter’s rubber seal with clean oil before threading it on by hand until snug.
Add the recommended volume (12 or 7 quarts). Start the engine and let it run for 60 seconds to circulate oil into the filter. Shut it off, wait 5 minutes, and check the dipstick level. Top off if necessary to reach the “Full” indicator mark.
Audible — Listen Free for 30 Days
One free credit a month and thousands of titles included.
Listen Free for 30 DaysYear-by-Year Ram 3500 Oil Specification Changes
Evolution of the 6.7L Cummins Maintenance Cycle
Since the introduction of the 6.7L Cummins platform, oil capacity has remained remarkably stable at 12 quarts. However, the required API specifications have evolved alongside emission regulations. While a 2020 model requires API CK-4, older models may have functioned on CJ-4. It is essential to consult your specific door sticker or owner’s manual, as mid-model-year production changes sometimes update filtration requirements or viscosity recommendations based on updated emissions tuning.
Comparing Ram 3500 and Ram 2500 Capacity Requirements
The Ram 2500 and 3500 are effectively siblings regarding engine maintenance. They share the same 6.7L Cummins and 6.4L HEMI architecture. Consequently, if you are servicing a 2020 Ram 2500, the oil capacities are identical to the 3500. Always ensure you are checking the engine oil rather than transmission or transfer case fluids, as those capacities vary drastically between models.
12 QT
7 QT
2020 Ram 3500 Oil Capacity Questions Answered
Recommended Best Deal Products
While 15W-40 is a common diesel oil, 2020 Ram manuals typically specify 5W-40 synthetic for optimal cold-start protection. Consult your manual’s temperature-viscosity chart before choosing 15W-40.
Yes. The 6.7L Cummins requires a high-capacity diesel filter, while the 6.4L HEMI uses a standard gasoline-type filter. They are not interchangeable.
Overfilling can lead to “aeration” of the oil, where the crankshaft whips air into the oil, creating bubbles. This reduces lubricity and can blow out engine seals. If overfilled, drain the excess immediately.
To maintain your 2020 Ram 3500 in peak condition, remember these core takeaways: the 6.7L Cummins requires 12 quarts of API CK-4 oil, while the 6.4L HEMI requires 7 quarts of MS-12633 certified oil. Never bypass the oil filter replacement, as it holds a significant portion of your engine’s oil volume. Always verify your final oil level using the dipstick after the engine has run and settled. For specific ambient temperature requirements, your owner’s manual remains the ultimate authority. Bookmark this page for your future service intervals to ensure your truck remains a reliable powerhouse on the road.
Audible Premium Plus — Annual Membership
12 audiobook credits up front, plus the full Audible catalogue.
See Annual Plans
