In most modern 5.7L HEMI engines, the factory-recommended viscosity is typically 5W-20. 5W-30 can be used in hot climates or under heavy load if your manual allows it. Always verify the exact specification for your year/model in the owner's manual or with a dealer.
What the manual says about oil viscosity
The official guidance for 5.7 HEMI engines varies slightly by year and climate. The points below reflect common OEM guidance across many 5.7L HEMI applications; always confirm your specific vehicle.
- 5W-20 is the standard grade for most contemporary 5.7L HEMI applications in Dodge/Chrysler products, providing fuel economy and adequate protection under normal driving conditions.
- 5W-30 is permitted in hot climates or under heavy-load/high-temperature conditions when your owner’s manual or dealer-approved service bulletin allows it.
- Oil must meet current API/S ILSAC specifications (such as API SN/SN Plus and ILSAC GF-6) and be Mopar-approved or equivalent to maintain warranty and engine protection.
Bottom line: Always use the viscosity and spec specified for your exact year/model in the owner's manual. If you routinely operate in extreme heat or tow heavy loads, verify whether 5W-30 is allowed for your engine variant.
How to decide which oil to use in your 5.7 HEMI
To determine the right oil for your engine, follow these steps tailored to year, climate, and use.
- Check your owner's manual or the door jamb sticker for the recommended viscosity (5W-20 or 5W-30) and any special service bulletins for your engine variant.
- Identify whether your engine is equipped with features that affect viscosity choices (for example, MDS) and confirm any special OEM guidance tied to those features.
- Assess your climate and typical driving conditions (cold starts, hot summers, towing, or frequent idling); climate can influence the optimal grade.
- Look for the required oil specification on the bottle (API rating and GF-6 or other certification) and ensure it meets or exceeds the OEM spec.
- Decide between conventional, synthetic, or synthetic-blend oils based on your drain interval, budget, and engine age. Synthetic oils often provide better protection and longer change intervals.
Bottom line: In most cases, 5W-20 is the default for modern 5.7 HEMIs, with 5W-30 as an acceptable alternative only if endorsed by the manufacturer for your vehicle and climate.
Special considerations
Additional considerations for high-mileage engines or towing
High-mileage engines, frequent towing, or operation in extreme heat may justify using a slightly higher-viscosity oil if the OEM allows it. Always verify with your dealer and consult the owner’s manual before switching away from the recommended grade.
What to do if you’re unsure
If you’re unsure about the right oil for your 5.7 HEMI, contact your local Chrysler-Dodge dealership or a trusted mechanic. Provide your VIN, model year, climate, and typical driving patterns to get precise guidance.
Summary
For most 5.7L HEMI engines, use the viscosity specified by your owner's manual, typically 5W-20 for daily driving. 5W-30 can be used in hot climates or under heavy-load conditions if explicitly allowed by the manual. Always prioritize OEM guidance and oil that meets API/SN/SF GF-6 specifications. Regular oil changes with the right grade protect engine longevity and performance.