Complete Oil Specifications
Your 2021 Ram 1500 5.7L HEMI V8 requires 5W-20 synthetic blend or full synthetic oil meeting Chrysler MS-6395.
Quick Reference
| Specification | Value |
|---|---|
| Viscosity | 5W-20 |
| Standard | Chrysler MS-6395 / API SP |
| Capacity (with filter) | 7.0 quarts |
| Oil Filter | Mopar 4892339AA (MO-339) |
| Interval | max 10,000 miles or 1 year |
Why MS-6395 5W-20 is Critical
The 5.7L HEMI engine uses the Multi-Displacement System (MDS) to shut down cylinders for fuel economy. MDS operation is hydraulically controlled by engine oil pressure. You MUST use oil that meets Chrysler MS-6395. Using thicker oil (like 10W-30) or oil without the correct flow additives can cause:
- ❌ MDS system failure (Check Engine Light P3400)
- ❌ Valve lifter noise (“HEMI tick”)
- ❌ Reduced fuel economy
Ram-Approved Oil Brands
-
✅ Pennzoil Platinum 5W-20 Full Synthetic
-
✅ Valvoline Advanced Full Synthetic 5W-20
-
✅ Castrol GTX Magnatec 5W-20
-
✅ Mobil 1 5W-20
-
✅ Royal Purple 5W-20
Always check the back of the bottle for “Chrysler MS-6395”.
Severe Service Check
The Oil Life Monitor will alert you when to change oil. However, expect shorter intervals (around 4,000 miles) if you:
- Tow trailers or haul heavy loads
- Drive in dusty or off-road conditions
- Idle extensively (work site use)
- Drive in stop-and-go traffic in hot weather (>90°F)
Installation Details
Drain Plug Torque: 25 ft-lbs
Use a new crush washer if applicable.
OEM Filter: Mopar 4892339AA (MO-339)
Aftermarket Filters:
-
WIX 57060
-
K&N HP-1017
-
Mobil 1 M1-113A
Pro Tip: The oil filter is located on the passenger side, above the front differential. Use a form-a-funnel or plastic bag to divert oil away from the frame/diff to avoid a mess.
FAQs
What oil does a 2021 Ram 1500 5.7 HEMI take?
SAE 5W-20 oil meeting Chrysler MS-6395.
How many quarts of oil does the 5.7 Hemi hold?
7.0 quarts (6.6 liters).
Can I use 0W-20?
Ram officially recommends 5W-20 to ensure proper MDS function. Stick to 5W-20 unless you are operating in consistently sub-zero temperatures.
How often should I change the oil?
Follow the standard Oil Life Monitor. Do not exceed 10,000 miles or 12 months, regardless of what the monitor says.
Last verified: 2026-02-23 | Source: OEM Owner’s Manual