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.
Need these specs on your phone? Download OilFinderPro app for offline access and oil change reminders.
Last verified: 2026-02-23 | Source: Needs OEM source confirmation (manual/spec page URL pending).