What is the best oil to run in a 5.7 Hemi?
In most cases, synthetic 5W-20 oil that meets the Chrysler/Mopar specification is the best default choice for a 5.7 Hemi, with 5W-30 available in specific conditions. Always verify the exact specification in your owner’s manual or on the oil filler cap for your exact model year and configuration.
The 5.7-liter Hemi is used across several Dodge, Chrysler, Jeep, and Ram models, and oil recommendations can vary slightly by year, drivetrain, and climate. This article explains the current, broadly applicable guidance and offers practical steps to choose the right oil for your vehicle and driving conditions.
Factory guidance and general practice
The following guidelines reflect common OEM recommendations for many 5.7 Hemi engines in contemporary Dodge/Chrysler/Ram applications. Individual model-year manuals should always take precedence.
- 5W-20 synthetic oil that meets API SP (or SN) and ILSAC GF-6, with Mopar MS-6395 approval. This is the default specification for most recent 5.7 Hemi engines.
- 5W-30 synthetic oil is a permitted alternative in hot climates, during heavy towing, or when the owner's manual specifies it for your exact vehicle. Always confirm the viscosity allowed for your year/model.
- Prefer full-synthetic or synthetic-blend oils over conventional oil for better protection, especially under severe service or with extended drain intervals.
In practice, most drivers rely on 5W-20 synthetic as the baseline. While 5W-30 offers flexibility for specific conditions, it should be used only when your manual approves it for your exact vehicle configuration.
Climate and usage considerations
Oil viscosity and choice are influenced by climate, towing, and driving style. The goal is to maintain adequate lubrication and protection across the engine’s operating range while preserving fuel economy.
When to opt for 5W-30 instead of 5W-20
Use 5W-30 when you regularly operate in hot environments, tow heavy loads, or drive the vehicle in conditions that place extra strain on the engine oil. Always check the vehicle’s owner’s manual and the oil filler cap to ensure 5W-30 is an approved option for your exact year and configuration.
For extreme heat or demanding work, 5W-30 can provide a higher level of protection against oil thinning at high temperatures, but it may slightly impact fuel economy compared with 5W-20. The key is aligning with the manufacturer’s guidance for your VIN and year.
Maintenance and intervals
Follow the factory-recommended oil change intervals, printed in the owner’s manual or on the service label. Synthetic oils typically support longer change intervals under normal driving, but severe service (short trips, frequent idling, dusty conditions, extreme temperatures, or regular towing) shortens the applicable interval.
When in doubt, rely on the service reminder system and consult a trusted technician to ensure the correct oil type, filter, and fill amount for your specific vehicle.
Practical steps to choose the right oil for your 5.7 Hemi
To make a confident choice, follow these steps that combine manufacturer guidance with everyday practicality.
- Identify your exact model year, drivetrain, and whether your vehicle has MDS or other variants that might influence oil specs. This information is typically found in the owner’s manual or on the door placard.
- Check the owner's manual or filler cap for the approved viscosity (most commonly 5W-20, with 5W-30 as an allowed alternative in certain conditions).
- Choose a high-quality synthetic or synthetic-blend oil that meets API SP (or SN) and ILSAC GF-6, with Mopar MS-6395 approval when possible.
- Use a compatible oil filter and perform oil and filter changes at the recommended intervals. Consider extended intervals only if your manual permits and you drive under favorable conditions.
Implementing these steps helps optimize engine protection, efficiency, and reliability across different driving scenarios.
Summary
For most 5.7 Hemi engines, the best default is a high-quality synthetic 5W-20 oil that meets API SP and ILSAC GF-6 with Mopar MS-6395 approval. You can switch to 5W-30 in hot climates or when towing, but only if your owner’s manual and the oil cap authorize the change for your exact vehicle. Always follow the manufacturer’s guidance, use a quality filter, and adhere to the recommended oil-change intervals to maintain engine health.
