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Best Engine Oil for RAM 1500 5.7L HEMI V8 (395 HP)
The RAM 1500 DT (2019+) with the 5.7L HEMI V8 is America’s best-selling full-size truck powertrain, producing 395 HP and 410 lb-ft from the legendary HEMI architecture. The fifth-generation RAM introduced Multi-Displacement System (MDS) cylinder deactivation — shutting down four of eight cylinders under light load — and the optional eTorque 48V mild hybrid system. Both technologies affect oil demands in ways that distinguish the modern HEMI from its predecessors. The engine requires 0W-20 meeting Mopar MS-6395 — an unusually thin viscosity for a 5.7-liter V8 that reflects Stellantis’s fuel economy engineering.
Quick Answer: Recommended Oil
For RAM 1500 5.7L HEMI V8 (395 HP):
- Recommended viscosity: SAE 0W-20 (alternative: 5W-20)
- Oil capacity: 7 quarts with filter
- Required norm: API SP / Mopar MS-6395
MDS Cylinder Deactivation and Oil Quality
The HEMI’s MDS system deactivates cylinders 1, 4, 6, and 7 under light throttle (typically highway cruising at 55-65 mph). Solenoid-actuated lifters collapse to prevent valve operation in the deactivated cylinders. These solenoid lifters depend on clean, correctly viscous oil for reliable actuation.
Known MDS lifter failures are the HEMI’s most documented issue. The solenoid lifters can stick or collapse, causing misfires, ticking noises, and eventually requiring lifter replacement ($2,000-4,000 at a dealer). Degraded oil with contamination or viscosity loss from extended drain intervals is a primary contributor to lifter malfunction. Quality 0W-20 oil changed at or before 10,000 miles is the best prevention.
eTorque mild hybrid adds a belt-driven motor-generator and 48V lithium-ion battery. The system enables smoother start-stop operation and brief torque fill during gear changes. The additional start-stop cycling demands instant oil pressure at each restart — 0W-20’s rapid cold-flow properties are essential.
Why 0W-20 in a 5.7L V8?
The modern HEMI’s bearing clearances, oil pump, and variable valve timing system are engineered for 0W-20. This ultra-thin viscosity reduces internal friction, contributing approximately 1-2% fuel economy improvement over 5W-30 — critical for CAFE compliance in a full-size truck. Stellantis validated the HEMI’s durability with 0W-20 across millions of test miles including towing scenarios. Do not substitute 5W-30 — it is not approved for this engine.
Technical Specifications: 5.7L HEMI
| Specification | Value |
|---|---|
| Displacement | 5,654cc (345 cu in) |
| Layout | V8 90-degree, OHV, 16 valves |
| Cylinder Deactivation | MDS (4-cylinder mode) |
| Valve Timing | VVT (Variable Valve Timing) |
| Power | 395 HP @ 5,600 RPM |
| Torque | 410 lb-ft @ 3,950 RPM |
| Towing Capacity | Up to 12,750 lbs |
| Recommended Viscosity | SAE 0W-20 |
| Oil Capacity (with filter) | 7 quarts |
| Required Norm | API SP / MS-6395 |
Oil Change Intervals
RAM Official: 10,000 miles or 12 months (oil life monitor).
Recommended: 7,500-10,000 miles. For towing, reduce to 5,000-7,500 miles. The MDS lifters benefit from fresh oil — extending intervals is false economy on the HEMI.
Conclusion
The RAM 1500 5.7L HEMI requires API SP 0W-20 meeting MS-6395, approximately 7 quarts. MDS cylinder deactivation lifter health depends directly on oil quality and change intervals. Mopar MaxPro 0W-20 is the factory choice. Change at or before 10,000 miles, shorten for towing.
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As an Amazon Associate, we may earn from qualifying purchases. This doesn't affect our recommendations — we only suggest oils that hold the exact OEM approval for your engine.