For most 5.7 Hemi engines, the standard recommendation is 5W-20 full synthetic (or synthetic-blend). In very hot climates or when towing or hauling, 5W-30 may be acceptable if your owner's manual allows it. Always confirm the exact specification for your year and model in the manual.
Below is a detailed look at how to choose the right oil for your 5.7 Hemi, from viscosity and type to change intervals and brand specifications. The guidance applies to popular 5.7 Hemi applications in Ram trucks, Challenger, Charger, and related Dodge/Chrysler vehicles, but always verify with your specific vehicle’s manual.
Recommended oil viscosity and type
These options reflect common guidance for the 5.7 Hemi, with full synthetic typically offering the best protection and longevity. Always cross-check your owner's manual for the exact requirement for your year and trim.
- 5W-20 full synthetic (preferred for most climates and driving styles)
- 5W-20 synthetic-blend or conventional in a pinch, if full synthetic isn’t available or budget dictates
- 5W-30 full synthetic (acceptable in hot climates or when towing/heavy-duty use is common if the manual allows it)
- 0W-20 or other viscosities are not commonly recommended for the 5.7 Hemi unless explicitly specified in the manual
In practice, most drivers will be best served by 5W-20 full synthetic, with 5W-30 reserved for extreme heat or heavy-use situations where the manual confirms allowance.
Oil change intervals and maintenance
Change intervals depend on oil type and how you drive. Modern Hemi engines rely on an oil life monitor to optimize changes, but broad guidelines exist if you don’t have a monitor.
- Synthetic oil: follow the oil life monitor; typical ranges often land around 7,500–10,000 miles under normal conditions
- Conventional oil: typically 3,000–5,000 miles or 3–6 months, whichever comes first
- Severe service (towing, frequent short trips, dusty roads, extreme heat): shorten intervals regardless of oil type
Always prioritize the vehicle’s oil life monitor and the manual’s guidance. If you tow or operate in harsh conditions, err on the side of more frequent changes.
Choosing a brand and specification
When selecting oil, aim for products that meet recognized specifications to ensure compatibility with the 5.7 Hemi’s tolerances and warranty requirements. The key specs to verify include API SN or newer, ILSAC GF-6 (or newer), and the Mopar/Chrysler MS-6395 specification used on many Mopar engines. The right viscosity must match your climate and usage.
Key specs to look for
- API SN or newer (e.g., SP) compliance
- ILSAC GF-6 or newer (where applicable)
- Mopar MS-6395 specification (Chrysler-approved for many 5.7 Hemi engines)
- Viscosity: 5W-20 as default; 5W-30 allowed only if your manual permits
Choosing oil that meets these specs helps protect the engine, maintain performance, and keep warranty coverage intact. If you tow regularly or live in extreme temperatures, consult your dealer for any model-year-specific caveats.
Bottom line and practical steps
For most owners, start with a high-quality 5W-20 full synthetic oil and the recommended 7-quart-plus oil capacity (plus filter) for a typical 5.7 Hemi. Use 5W-30 only when the manual allows it, such as in hot climates or with frequent heavy towing. Rely on the oil life monitor to time changes, and adhere to conventional intervals if you don’t have that system.
Summary
The best oil for a 5.7 Hemi is typically a high-quality 5W-20 full synthetic (or synthetic-blend). In very hot climates or during heavy towing, 5W-30 can be appropriate if the manual permits it. Always verify the exact viscosity and specification in your owner’s manual, and follow the vehicle’s oil life monitor or the manufacturer’s recommended intervals for changing the oil.