The 2021 Ram trucks with the 3.6L Pentastar engine require SAE 5W-20 engine oil, preferably synthetic-blend or full synthetic, and should meet current API and ILSAC specifications. Check the owner’s manual for exact guidance for your model and climate.
Oil specification for the 3.6L Pentastar
Understanding the right oil viscosity and grade helps ensure lubrication, fuel economy, and warranty coverage for the 3.6L engine used in 2021 Ram models.
Key characteristics to look for when shopping for the oil.
- Viscosity: SAE 5W-20
- Oil type: Synthetic-blend or full synthetic
- Certification: API SP (or SN) and ILSAC GF-6 compatibility
Using the recommended 5W-20 viscosity with a synthetic oil type that meets API SP/SN and ILSAC GF-6 helps ensure proper lubrication across typical temperatures and driving conditions. Do not switch to a different viscosity unless advised by Chrysler for your climate.
Oil capacity and change intervals
In addition to the oil grade, drivers should know how much oil the engine holds and how often to change it.
Guidance on capacity and maintenance for the 3.6L engine in 2021 Rams.
- Oil capacity (with filter): about 5.9 quarts (roughly 5.6 liters)
- Change intervals: follow the vehicle’s Oil Life Monitor and owner’s manual; with synthetic oil, intervals are typically longer than conventional oil and may range around 7,500 miles or more under normal driving, but severe conditions or towing can require more frequent changes
- Best practice: use a full-synthetic or synthetic-blend oil for optimal protection and longer drain intervals
Always verify the exact interval for your vehicle and driving conditions in the owner's manual or via the vehicle's oil life system.
Brand and practical tips
Choosing the right brand and following best-practice steps helps ensure the 3.6L engine remains healthy. Consider reputable brands that meet the API SP and GF-6 standards and carry Mopar approvals if possible. When performing oil changes, use the correct filter and torque spec, reset the oil life monitor, and check for any service advisories from Ram/Chrysler.
Summary
The 2021 Ram with the 3.6L Pentastar calls for SAE 5W-20 engine oil, preferably synthetic-blend or full synthetic, meeting API SP or SN and ILSAC GF-6 standards. The engine holds about 5.9 quarts with a filter, and change intervals follow the Oil Life Monitor and the owner’s manual, typically around 7,500 miles under normal conditions with synthetic oils, but it can be shorter under severe driving. Always refer to the specific manual for your model and climate, and opt for brands that meet the OEM specs.