The Dodge Ram 1500 is more than just a truck — it’s a work partner, weekend warrior, and daily driver all in one. But to keep that powerful HEMI or Pentastar engine running smoothly for years, the right engine oil is essential.
The best Dodge Ram 1500 engine oil type is SAE 0W-20 or 5W-20 full synthetic, like Pennzoil Ultra, Mobil 1, or Mopar, offering superior protection, performance, and longevity for your engine.
In this guide, we’ll break down the best Dodge Ram 1500 engine oil types, based on expert recommendations and real-world owner experience.
Why the manufacturer matters: follow the owner’s manual
Ram (FCA) engineers test engines with specific oil viscosities and additive specs. Using the manufacturer-recommended viscosity (e.g., 5W-20 for many 5.7 HEMI 1500s or 0W-20 for Pentastar) ensures proper oil pressure, cam phasing control, MDS/eTorque behaviour, emissions operation and long-term wear characteristics. That’s why the owner’s manual and the oil cap are the first and best references.
Viscosity explained — what 0W-20, 5W-20 and 5W-30 mean
SAE viscosity numbers describe oil flow at cold start (the “W” number) and at operating temperature (the second number).
- 0W-20 / 5W-20: thinner at operating temperature — improves fuel economy and helps modern variable valve/timing systems work as designed.
- 5W-30: slightly thicker at operating temps — can give extra film strength under extreme loads or high temps, but may affect fuel economy and some control-system calibrations. Always prefer the viscosity the manual specifies unless you have a strong reason (extreme climate, high mileage, or known engine issue).
The HEMI 5.7L question: Can I run 5W-30 instead of 5W-20?
This is the most common debate among Ram owners. Factory guidance for many 5.7L HEMI Rams has been 5W-20 (MS-6395 compliant). Some owners and techs prefer 5W-30 for perceived extra protection, especially in older non-MDS HEMI or very hot climates.
But changing viscosity from factory spec can sometimes trigger engine control codes, slightly change MDS/eTorque behaviour, or marginally reduce fuel economy.
If you choose 5W-30, pick an oil that still meets the proper Chrysler/FCA spec and be aware of possible tradeoffs.
Synthetic vs conventional — always pick full synthetic for modern Rams
Modern Ram engines (Pentastar, HEMI, Ecodiesel) benefit strongly from full synthetic oils. Synthetics resist thermal breakdown, flow faster at cold start, and maintain protective film at higher temperatures — all important for longevity and for keeping valve lifters and camshafts happy.
Use a full synthetic that meets the FCA/MS-6395 (or the diesel spec for EcoDiesel) where applicable.
Recommended oil specs and approvals to look for
When shopping for oil, look for:
- API certification (current API SP or whatever is current at purchase time).
- Chrysler / FCA MS-6395 mention the HEMI 5.7L application (many recommended 5W-20 oils will state compliance).
Oil capacity and service intervals (practical numbers)
- 5.7L HEMI (Ram 1500): around 6.5–7.0 quarts (varies by model year and filter). Check the dipstick and the owner’s manual. Many service kits list 7 quarts for a full fill.
- 3.6L Pentastar: capacity is smaller (check your manual for the exact figure).
Service interval advice: - Follow the owner’s manual interval as the baseline. Many owners prefer 5,000–7,500 miles with full synthetic for peace of mind — frequency depends on driving conditions (towing, idling, dusty work increases frequency).
Best oil brands and specific products that Ram owners favor
Many Ram owners and independent mechanics recommend these full-synthetic oils (ensure the product meets the correct spec for your engine):
- Mopar / OEM synthetic (MS-6395 compliant) — safe and factory-approved.
- Pennzoil Platinum / Ultra (often MS-6395 compliant options exist).
- Mobil 1 (widely used and available; many owners use Mobil 1 EP or Mobil 1 Full Synthetic 5W-20/0W-20).
- Royal Purple, Valvoline, Shell, Eurol — various full synthetic blends meet required specs; pick MS-6395 or equivalent.
Note: brand preference often comes from personal experience and service history; always confirm the jug states the correct viscosity and spec.
Practical tips — what to do at the oil change
- Always use an oil filter rated for synthetic oil. High-quality filters with higher bypass limits are preferred (Mopar, Mobil 1, WIX, Mahle, etc.).
- Fill to the dipstick — don’t overfill. If the manual lists 7 quarts, start with the recommended amount and check the dipstick; adjust as needed.
- Note the oil change date and mileage; synthetic gives more flexibility, but environmental and driving conditions should guide intervals. For heavy/towing use, shorten the interval.
High-mileage Ram 1500 — any different advice?
For high-mileage engines with wear, some owners move to slightly thicker oils (e.g., 5W-30) to improve oil pressure and reduce oil consumption. That can be acceptable if it doesn’t conflict with engine codes or emissions systems, but it’s best to:
- Confirm the engine’s original viscosity and any factory limitations.
- Consult a trusted mechanic.
- Choose a high-quality synthetic formulated for high-mileage engines (additives that condition seals).
Quick comparison table (common Ram 1500 engines)
| Engine | Recommended oil type | Typical capacity (approx) |
| 3.6L Pentastar V6 | 0W-20 full synthetic. | See manual (≈5–6 qts) |
| 5.7L HEMI V8 | 5W-20 full synthetic (FCA MS-6395). | ~6.5–7.0 quarts (varies; check dipstick). |
| 3.0L EcoDiesel | Diesel-spec synthetic (follow manual). | See manual |
FAQs
What type of motor oil is best for a RAM 1500?
Full synthetic oil like SAE 0W-20 or 5W-20 is best for a Ram 1500, ensuring smooth performance, better protection, and longer engine life.
What is the recommended oil for a 5.7 Hemi?
Most 5.7 HEMI engines recommend SAE 5W-20 full synthetic oil meeting FCA MS-6395 specs, which helps maintain MDS operation, improve fuel economy, and protect internal engine parts.
Is 5w30 thicker than 5w20?
Yes, 5W-30 is slightly thicker at high temperatures than 5W-20, which can offer extra protection but may slightly affect fuel economy or engine efficiency.
How to avoid hemi tick?
Use high-quality synthetic oil, change it regularly, avoid extended idling, and use top-grade fuel to keep lifters and valves clean, reducing the chance of HEMI tick.
Who makes the best synthetic oil?
Pennzoil, Mobil 1, Valvoline, and Royal Purple are trusted brands making high-quality full synthetic oils that meet Ram’s specifications and deliver reliable protection for modern engines.
Can you mix 5w20 and 5w30?
Yes, you can mix them in emergencies, but it’s better to stick to the manufacturer-recommended viscosity for best performance and proper engine system calibration.
How often should I change the oil in my 5.7 Hemi?
Change the oil every 5,000–7,500 miles with full synthetic for normal use, and more often if you tow, idle a lot, or drive in harsh conditions.
Is Pennzoil Platinum a full synthetic?
Yes, Pennzoil Platinum is a full synthetic oil made from natural gas, designed to provide excellent wear protection, keep the engine clean, and improve efficiency.
Conclusion
Keeping your Dodge Ram 1500’s engine healthy starts with choosing the right oil. Whether you drive a HEMI, Pentastar, or EcoDiesel, following the factory-recommended viscosity and quality standards is the safest choice. Full synthetic oils like Pennzoil, Mobil 1, Mopar, and Valvoline give excellent protection, smoother performance, and longer service life. Check your owner’s manual, use a quality filter, and stick to proper change intervals. With the right oil and regular maintenance, your Ram 1500 will deliver the power, reliability, and performance you count on — mile after mile.
