What kind of oil does a 5.9 Dodge Ram take?
The 5.9L Magnum V8 in Dodge Rams typically uses 5W-30 motor oil that meets Chrysler’s MS-6395 specification, with the appropriate API rating for your engine. Always confirm the exact requirement from your owner’s manual or the under-hood data plate.
This article explains the standard oil needs for the 5.9, how it can vary by model year and climate, and how to verify the correct specification. The 5.9 was used in several Ram variants from the late 1990s into the early 2000s, and while 5W-30 is the common baseline, certain conditions may call for alternatives. Read on for practical guidance and a quick checklist to keep your engine properly lubricated.
Standard oil type and viscosity
These are the typical, widely accepted options for a 5.9L Magnum engine. Always ensure the oil you buy meets the Chrysler MS-6395 spec and the current API service category for your vehicle.
- Recommended viscosity: 5W-30 for most conditions, meeting the Chrysler MS-6395 specification and API grade appropriate for your engine.
- Alternative in hot climates or with heavy loads: 10W-30 can be used in some 5.9L engines if the manual permits, and is a common alternative in warmer regions.
- Cold climates: 0W-30 or 0W-40 might be used if allowed by MS-6395, but verify with your manual; many owners stick with 5W-30 for simplicity.
Note: Always verify the exact specification on the engine oil filler cap or the owner's manual; some late-1990s to early-2000s Rams require the MS-6395 oil specification, while newer guidance may reference API SP or its successor along with MS-6395. The capacity is approximately 6 quarts with a filter, but check the service manual for your exact engine variant and filter size.
Model-year specifics and verification
The 5.9L Magnum V8 was used across various Ram trucks and years; while the core recommendation remains 5W-30, there can be slight differences depending on the exact year, state of tune, and whether the engine has been modified or uses different OEM filters. Always consult the sill plate sticker under the hood or the owner's manual for the precise specification, and adhere to the service interval your driving conditions warrant.
Why specs matter
Using oil that doesn't meet MS-6395 can affect lubrication and warranty coverage, while the right grade supports proper oil pressure and cooling for the 5.9L. This is especially important if the vehicle has been modified or is used for heavy towing.
Brands and finding MS-6395
Most major brands offer 5W-30 oils that meet MS-6395. Look for containers that list MS-6395 along with API service SM/SL or SP and your chosen viscosity. For example, Mobil 1, Pennzoil, Valvoline, Castrol, and others commonly meet these specs.
Capacity and maintenance tips: The engine holds roughly 6 quarts with filter; follow oil-change intervals per manual, or more frequently under severe service.
Practical checklist
Before you buy oil, you can run through this quick checklist to ensure compatibility and proper maintenance.
- Confirm year and model to ensure the correct engine variant is referenced.
- Check the under-hood plate or owner's manual for the exact viscosity and MS-6395/API rating required.
- Use 5W-30 as standard; 10W-30 is often acceptable in hotter climates or heavier-load scenarios if the manual allows.
- Allow for about 6 quarts of oil plus a filter when performing a change.
- Choose a reputable brand that clearly states MS-6395 compliance on the label.
With the right oil, your 5.9L Magnum can run smoothly across miles and seasons.
Summary
The 5.9 Dodge Ram normally takes 5W-30 motor oil that meets Chrysler MS-6395 and API requirements. Always verify the exact spec for your year and drive conditions in the owner's manual or on the engine plate, and follow the recommended oil-change intervals.
