Should I run full synthetic oil in my 5.7 Hemi?
Yes — for most 5.7 Hemi engines, you can and should consider running full synthetic oil for better protection and performance. The exact viscosity and oil spec depend on your model year and climate, so always check the owner's manual or your dealer for the approved grade.
Manufacturer guidance and oil specs
Understanding what the factory approves helps ensure warranty coverage and optimal engine life. In recent years, most 5.7 Hemi applications use a 5W-20 or 5W-30 viscosity with oils that meet API SN or GF-6 and Mopar/Chrysler guidelines. If in doubt, use synthetic oil that explicitly lists compatibility with Chrysler/Mopar engines and the required viscosity for your vehicle's year and climate.
Viscosity options for the 5.7 Hemi
Viscosity choices vary by model year and climate. Common recommendations include 5W-20 to optimize fuel economy and cold-start performance, or 5W-30 in hotter climates or under heavier loads. Oils should meet API SN or newer standards and be Mopar-approved or equivalent to ensure compatibility. Always follow the manual for the exact grade.
Benefits and trade-offs of full synthetic oil
Full synthetic oil provides several advantages for the 5.7 Hemi, but there are costs and considerations. Here are the key points.
- Better high-temperature protection and resistance to breakdown when towing or hauling heavy loads.
- Improved cold-start lubrication and quicker protection in cold climates.
- Greater resistance to oxidation and sludge, helping keep the engine cleaner over time.
- Potentially longer intervals between oil changes when following OEM guidelines and the oil's capabilities, though you should always follow the manual's interval and conditions for your vehicle.
- Typically easier to meet warranty requirements since synthetic oils are widely standardized across manufacturers.
In summary, full synthetic tends to improve protection and longevity under demanding conditions, but your exact benefits depend on usage and climate.
When to consider conventional or synthetic-blend oil
Not every scenario warrants full synthetic. Here are situations where a conventional or synthetic-blend may be acceptable or economically sensible.
- Budget constraints: Conventional or synthetic-blend oil costs less upfront.
- Older engine with high mileage or minor leaks: Some owners prefer blends to balance cost with protection, though many synthetic blends still offer strong protection for aging engines.
- Warranty or dealer requirements: Some warranties or service plans may specify certain oil types; always verify your contract or ask the dealer.
- Light-duty, daily driving in mild climates: If you mostly do short trips in moderate temperatures, conventional may be sufficient, though many drivers still opt for synthetic for added protection.
Synthetic-blend or conventional oils can be viable in these scenarios, but weigh upfront cost against long-term protection and maintenance needs.
Maintenance plan and practical tips
To maximize engine health of a 5.7 Hemi, follow these steps when selecting and changing oil.
- Check your owner's manual for the approved viscosity (for example 5W-20 or 5W-30) and the oil specification (API/SN or GF-6 and Mopar approvals).
- Choose a full synthetic or synthetic-blend that meets those specs and is compatible with your climate and driving style.
- Use a new filter and fill to the manufacturer's recommended capacity; consider a high-quality filter rated for longer service if you plan extended drain intervals.
- Follow OEM interval guidance; many modern vehicles permit longer intervals with synthetic, but do not exceed the maximum allowed by the manual or warranty terms.
- Monitor oil level and consumption, especially after switching oil types or after long trips; watch for leaks or unusual consumption and have issues inspected promptly.
By following these steps, you ensure the oil choice aligns with your vehicle's needs and warranty requirements.
Summary
For most 5.7 Hemi engines, running full synthetic oil is compatible and often advantageous, especially in demanding conditions like hot climates or heavy towing. Always adhere to the exact viscosity and oil spec listed in your owner's manual, or consult your dealer. Synthetic oils typically offer better protection, easier cold starts, and the potential for longer service intervals when permitted by the manufacturer, but weigh cost against your driving needs. In doubt, select a high-quality synthetic or synthetic-blend that meets API/SN or GF-6 standards and Mopar specifications to ensure reliable performance.
How often should I change the full synthetic oil on my RAM 1500?
every 7,500 to 10,000 miles
As a general rule, most Ram 1500 models should get an oil change every 7,500 to 10,000 miles, but if you do a lot of towing, city driving, or off-roading, it's smart to change it more frequently. Staying on top of this simple maintenance task can go a long way in protecting your truck's performance and longevity.
When should you not use full synthetic oil?
Better For Older Engines
This being said, however, it is still not recommended to use synthetic oil in engines that have experienced significant actions – specifically, those that have reached around 75,000 miles on the odometer.
Does a 5.7 hemi need full synthetic oil?
Use the SAE 5W-20 full synthetic oil if your truck has the 5.7L V8 HEMI gasoline engine. The eTorque system will also need lubrication on the front axle and rear differentials with 5W-20 motor oil for best results as you drive to the job site or when hauling a trailer behind you.
How to avoid hemi tick?
To avoid "Hemi tick," change the oil and filter regularly (around every 5,000 miles) using high-quality synthetic oil, and minimize prolonged idling. For extra prevention, you can consider a high-flow oil pump or using a high-quality oil filter with a good anti-drain back valve.
Maintenance and driving habits
- Perform regular oil changes: Adhere to a 5,000-mile interval and use high-quality synthetic oil to ensure proper lubrication.
- Use a high-quality oil filter: Choose filters with good anti-drain back valves to help maintain oil pressure at startup.
- Limit excessive idling: Avoid long periods of idling, as the oil pump may not provide sufficient lubrication at low RPMs.
- Check oil level: Ensure the oil is filled to the top of the max line for better lubrication.
Potential upgrades
- Install a high-flow oil pump: An upgraded oil pump, such as one from a Hellcat or 6.4L engine, can provide better oil pressure.
- Upgrade to non-MDS lifters: Replacing the Multi-Displacement System (MDS) lifters with non-MDS versions, like Hellcat lifters, can also prevent ticking.
- Upgrade exhaust headers: Some ticks are caused by exhaust leaks from the manifold. Upgrading to aftermarket headers can be a solution for this specific issue.
