The standard oil for the 2018 Ram 2500 with the 6.4-liter Hemi is synthetic 5W-20 that meets FCA MS-6395, with a capacity of about 7 quarts (including the filter). The recommended change interval with synthetic oil is roughly 10,000 miles (12 months). In hotter climates or when towing heavy loads, 5W-30 may be acceptable if permitted by your manual; always verify with the owner's manual or dealer.
The following details break down the recommended oil type, capacity, and servicing interval, so you can choose the right product and plan maintenance accordingly.
Recommended oil type and grade
Key specs to consider when selecting oil for the 6.4 Hemi include viscosity, and the official Chrysler specification the oil must meet. This helps ensure proper lubrication, fuel efficiency, and warranty compliance.
- Viscosity: 5W-20 synthetic motor oil is the standard recommendation for most climates and driving conditions.
- Specification: The oil must meet FCA MS-6395 (Chrysler/Fiat official specification). Many modern API/SUS labels also indicate compatibility, but MS-6395 should be the primary criterion.
- Alternatives: In some climates or service conditions, 5W-30 may be acceptable if permitted by the manual; always confirm with the owner’s manual or a dealer before switching from 5W-20.
In practice, choose a quality synthetic oil that explicitly lists MS-6395 on the label, and avoid blends that don’t reference this specification.
Oil capacity and maintenance interval
Understanding capacity and service timing helps you plan regular maintenance and avoid underfilling or overfilling the sump.
- Capacity: Approximately 7 quarts (about 6.6 liters) of oil with a filter change.
- Change interval: About 10,000 miles (16,000 kilometers) when using synthetic oil; use shorter intervals if you’re using conventional oil or under severe service (extreme heat, heavy towing, or lots of short trips).
- Severe-service notes: For towing, frequent short trips, or very hot conditions, follow the owner’s manual guidance or oil-life monitor recommendations for more frequent changes.
Remember to reset the oil life monitor after an oil change and to follow the vehicle’s on-board guidance as well as the manual’s specifications.
Practical tips and caveats
To ensure compatibility and performance, verify you’re purchasing oil that clearly lists MS-6395 on the bottle and select the correct viscosity for your climate. Use a quality filter matched to the OEM specification, and consider using a reputable brand with a track record for Dodge/Chrysler applications. If in doubt, consult your dealer or a trusted mechanic.
Summary
For the 2018 Ram 2500 with the 6.4 Hemi, use synthetic 5W-20 oil that meets FCA MS-6395, with an approximate capacity of 7 quarts including the filter. The typical oil-change interval with synthetic oil is around 10,000 miles (12 months). In extreme conditions or towing heavy loads, 5W-30 may be permissible if the manual allows it; always confirm with the owner’s manual. Adhere to the vehicle’s oil-life monitor and refer to the manual for climate- and usage-specific guidance.