Complete Oil Specifications
Your 2024 Mercedes-Benz GLS 450 requires 0W-20 full synthetic oil meeting Mercedes-Benz specification MB 229.71 and ACEA C5. The M256 3.0L inline-6 EQ Boost pairs a twin-scroll turbocharger with a 48V integrated starter-generator (ISG) for mild-hybrid energy recovery. MB 229.71 is mandatory — older approvals like MB 229.3 or 229.5 are not compatible with this engine’s particulate filter and start-stop system.
Quick Reference
| Specification | Value |
|---|---|
| Viscosity | 0W-20 |
| API Rating | MB 229.71 |
| ILSAC Rating | ACEA C5 |
| Capacity (with filter) | 8.5 quarts |
| Oil Filter | Mercedes-Benz A 000 180 22 09 |
| Normal Interval | 10000 miles |
Why 0W-20 is Critical for This Engine
The M256 EQ Boost undergoes frequent engine restarts from the ISG start-stop system, creating elevated camshaft and crankshaft bearing wear exposure. MB 229.71 requires 0W-20’s ultra-low cold-cranking viscosity to restore oil pressure in under a second after each restart. The specification also mandates low-SAPS chemistry to protect the gasoline particulate filter (GPF) mandatory on all M256-equipped vehicles sold after 2021.
Using incorrect oil will:
- ❌ Slow oil pressure recovery after ISG restarts, causing micro-wear on M256 plain bearings
- ❌ Block GPF channels with excess sulfated ash if high-SAPS oil is used
- ❌ Invalidate the Mercedes-Benz extended service approval — MB 229.71 is the current minimum standard
Mercedes-Benz-Approved Oil Brands
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✅ Mercedes-Benz Genuine Motor Oil 0W-20 (MB 229.71)
-
✅ Mobil 1 ESP 0W-20 (MB 229.71)
-
✅ Castrol Edge Professional C5 0W-20
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✅ Shell Helix Ultra Professional AG 0W-20
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✅ Liqui-Moly Special Tec AA 0W-20
The MB 229.71 approval number must appear on the oil container or manufacturer’s product data sheet. Oils only listing MB 229.3 or 229.5 should not be used.
Severe Service Check
You need the 5000-mile interval if you:
- Tow a trailer, fifth-wheel, or heavy load regularly
- Regularly carry 7 passengers with full luggage
- Drive in sustained stop-and-go city traffic
- Operate in extreme heat (sustained ambient above 100°F)
Installation Details
Drain Plug Torque: 22 ft-lbs
The M256 uses a plastic drain plug cap over the metal plug on some configurations — remove the cap before inserting the drain plug socket.
OEM Filter: Mercedes-Benz A 000 180 22 09
Aftermarket Filters:
-
Mann HU6008z
-
Mahle OX196/3D
-
Bosch 0451103370
Pro Tip: The M256 holds 8.5 quarts — fill slowly after the change and check the ASSYST PLUS oil level sensor reading in the instrument cluster after a 2-minute idle before shutting down.
FAQs
What oil does a 2024 Mercedes-Benz GLS 450 take? 0W-20 full synthetic oil meeting Mercedes-Benz MB 229.71 and ACEA C5 standards.
How many quarts does it need? 8.5 quarts with a new filter, 8.0 without.
Can I use the same oil as the GLS 580 or AMG GLS 63? No. The AMG 4.0L V8 uses different specifications. Only use MB 229.71 approved oil for the M256 3.0L.
Is synthetic oil required? Yes — MB 229.71 is a full-synthetic-only specification.
How often should I change the oil? Follow the ASSYST PLUS service indicator. As a baseline, every 10000 miles for normal driving. Do not exceed 1 year without a service regardless of the display.
Need these specs on your phone? Download OilFinderPro app for offline access and oil change reminders.
Last verified: 2026-05-31 | Source: 2024 Mercedes-Benz GLS 450 Owner’s Manual