Answer: SAE 5W-20 synthetic motor oil that meets Chrysler’s MS-6395 specification (API SN+/ILSAC GF-5).
The 2018 RAM 1500 with the 3.6-liter Pentastar V6 requires a full-synthetic oil that is compatible with FCA’s engineering standards. The official specification calls for 5W-20 synthetic oil that meets Mopar/MS-6395, with API SN or newer and ILSAC GF-5 or newer. Below is a concise guide to help you choose the right oil and observe proper maintenance practices for this truck.
Oil type and grade
To meet FCA specifications and ensure reliable lubrication, select a synthetic oil that is 5W-20 and certified to MS-6395. This standard is widely used for the 3.6L Pentastar in modern FCA vehicles and supports engine protection and warranty compliance.
- Viscosity: 5W-20
- Oil type: Full synthetic (preferred) or a synthetic blend that meets MS-6395
- Certification/standards: MS-6395 (Chrysler Mopar specification); API SN or newer; ILSAC GF-5 or newer
- Capacity and usage: Suitable for routine oil changes with synthetic oil; follow the vehicle’s oil life monitor for changes
Before listing the key requirements, note that the following criteria are essential for compatibility:
Using an oil outside these specifications can compromise lubrication quality and may affect warranty coverage.
Climate and service considerations
Climate and driving conditions can influence oil choice and change frequency. In typical moderate climates, 5W-20 synthetic per MS-6395 is standard. In extremely cold or hot environments, verify that your manual allows any alternate grade and follow the recommended guidelines for temperature extremes.
Is 0W-20 acceptable for very cold weather?
Some markets and model years may permit 0W-20 under certain conditions, but the default specification for the 2018 RAM 1500 3.6L is 5W-20. Always consult your owner's manual or a qualified technician to confirm whether 0W-20 is approved for your exact vehicle configuration and climate.
Oil change intervals and monitoring
Oil change intervals depend on driving conditions and the vehicle’s oil life monitoring system. Synthetic oils typically allow longer intervals, but conditions such as towing, heavy loads, frequent short trips, and dusty environments shorten the interval.
- Normal driving with synthetic oil: up to about 7,500 miles (12,000 km) between changes, or as indicated by the oil life monitor
- Severe driving conditions: more frequent changes (roughly 3,000–5,000 miles / 4,800–8,000 km) depending on usage
- Always rely on the vehicle’s Oil Life Monitor and your manual for the exact interval
Before listing the recommended intervals, consider these general guidelines:
Following the recommended interval and using the correct MS-6395-compliant 5W-20 synthetic oil helps preserve engine efficiency and supports warranty terms.
Summary
For a 2018 RAM 1500 with the 3.6L Pentastar, use a full synthetic 5W-20 oil that meets Chrysler MS-6395 standards (API SN+/ILSAC GF-5). Check your owner’s manual for any climate-specific notes or approved alternatives, and follow the oil life monitor or manual-recommended intervals to determine when to change the oil. When in doubt, consult a qualified technician or your local RAM service center to confirm the exact specification for your vehicle.