Complete Oil Specifications
Your 2023 Jeep Grand Wagoneer 6.4L HEMI V8 requires full synthetic SAE 0W-40 oil meeting Stellantis MS-12633 and API SP standards.
Quick Reference
| Specification | Value |
|---|---|
| Viscosity | 0W-40 |
| API Rating | SP (MS-12633) |
| Capacity (with filter) | 8.5 quarts |
| Oil Filter | Mopar MO-899 |
| Normal Interval | 8000 miles |
Why 0W-40 and MS-12633 Are Critical
The 6.4L HEMI 392 is a fundamentally different engine from the 5.7L HEMI — it produces significantly higher cylinder pressures and thermal loads, and it does not use Multi-Displacement System (MDS) cylinder deactivation. Stellantis’s MS-12633 specification mandates an oil with a substantially higher high-shear viscosity at 150°C than MS-6395 (the 5.7L spec), ensuring the 0W-40 maintains an adequate protective film under the 392’s aggressive combustion event.
The most common mistake: Using 5W-20 (specified for the 5.7L HEMI) in a 6.4L 392. This causes progressive lifter wear and the characteristic “HEMI tick” — a clicking noise from oil-starved upper valvetrain components. At sustained high throttle in a heavy SUV like the Grand Wagoneer, the consequences of using 5W-20 in a 392 are severe.
Using incorrect oil will:
- ❌ Cause “HEMI tick” lifter noise as the thin oil fails to maintain film on the camshaft lobes
- ❌ Lead to accelerated upper valvetrain wear from insufficient film strength under 392 cylinder pressures
- ❌ Void Stellantis/Jeep warranty — MS-12633 is a mandatory spec, not a preference
Jeep-Approved Oil Brands
-
✅ Pennzoil Platinum Euro Full Synthetic 0W-40
-
✅ Mobil 1 Full Synthetic 0W-40
-
✅ Castrol EDGE Full Synthetic 0W-40
-
✅ Mopar Genuine Engine Oil 0W-40
Look for MS-12633 on the label. Some 0W-40 oils marketed for European engines (e.g., BMW LL-01, MB 229.5) also meet this spec — verify the label lists MS-12633 specifically.
Severe Service Check
You need the 4000-mile interval if you:
- Tow a trailer or haul passengers at maximum GVWR regularly
- Drive in sustained mountain or grade conditions where the engine works under constant load
- Use the vehicle for off-road excursions in extreme heat
- Experience extreme temperature swings (desert days/cold nights)
Installation Details
Drain Plug Torque: 20 ft-lbs
OEM Filter: Mopar MO-899
Aftermarket Filters:
-
Wix 57899
-
Mobil 1 M1-210A
-
K&N HP-2010
Pro Tip: The Grand Wagoneer’s 6.4L has a larger sump than the 5.7L — verify you have at least 9 quarts on hand before starting the job. After filling, run the engine briefly, shut off, wait 5 minutes, and recheck the dipstick before the first drive.
FAQs
What oil does a 2023 Jeep Grand Wagoneer 6.4L HEMI take? Full synthetic SAE 0W-40 meeting Stellantis MS-12633 and API SP. Do not use 5W-20 — that is for the 5.7L HEMI and will damage the 6.4L 392 engine over time.
How many quarts does it need? 8.5 quarts with a new filter, 8.0 without.
Can I use 5W-20 or 5W-30 to save money? No. Using the wrong viscosity in the 6.4L HEMI is the most documented oil mistake on this platform. The high-shear film requirement of the 392 engine cannot be met by 5W-20. Over time, this causes irreversible valvetrain damage.
Is the Grand Wagoneer oil spec the same as the Wagoneer? No. The Wagoneer uses the 5.7L HEMI eTorque (5W-20, MS-6395). The Grand Wagoneer uses the 6.4L 392 HEMI (0W-40, MS-12633). Different engines with completely different oil requirements.
How often should I change the oil? Every 8000 miles or 1 year. Monitor the Oil Change Required indicator — in severe towing service it may trigger before 8,000 miles.
Need these specs on your phone? Download OilFinderPro app for offline access and oil change reminders.
Last verified: 2026-04-22 | Source: 2023 Jeep Grand Wagoneer Owner’s Manual