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Mercedes-Benz GLS 450 Engine Oil Capacity Calculator & Complete Technical Guide
This comprehensive guide provides detailed specifications, technical data, and an interactive calculator to determine the exact engine oil capacity for your Mercedes-Benz GLS 450 across all model years.
Proper oil capacity and specification are critical for maintaining engine performance, fuel efficiency, and longevity of your luxury SUV. This resource is based on factory service manuals and Mercedes-Benz technical bulletins.
Oil Capacity Calculator
Calculation Note: This calculator provides factory-specified capacities. Actual amounts may vary by ±0.3 quarts based on complete drain, oil cooler volume, and filter type. Always verify using the digital dipstick in your vehicle’s infotainment system.
2 Engine Oil Specifications & Technical Data
2.1 Mercedes-Benz Oil Approval Standards
Mercedes-Benz has developed specific oil approval standards that go beyond conventional API or ACEA classifications. For the GLS 450, the following standards apply:
| Approval Code | Description | Model Years | Key Requirements |
|---|---|---|---|
| MB 229.52 | Premium Synthetic Oil | 2020-2024 | Low SAPS, extended drain (up to 20,000 miles), fuel economy optimized |
| MB 229.51 | Advanced Synthetic Oil | 2017-2024 | Low SAPS, extended drain compatible, for gasoline/diesel engines |
| MB 229.5 | High-Performance Synthetic | 2016-2019 | Extended drain intervals, high temperature stability |
Using oil that does not meet Mercedes-Benz approval standards can lead to:
- Voided warranty claims for engine-related issues
- Premature timing chain wear (particularly in M256 engines)
- Increased fuel consumption and reduced performance
- Potential damage to the integrated starter generator (ISG) in EQ Boost systems
2.2 Viscosity Recommendations by Climate
The recommended oil viscosity for your GLS 450 varies based on ambient temperature and driving conditions:
| Temperature Range | Recommended Viscosity | Alternative Options | Notes |
|---|---|---|---|
| -40°F to +100°F (-40°C to +38°C) | 0W-30 (Primary Recommendation) | 0W-40, 5W-30 | Optimal for cold starts and fuel economy |
| 0°F to +120°F (-18°C to +49°C) | 5W-30 or 5W-40 | 0W-40 | Good all-season option for most climates |
| Consistently above 90°F (32°C) | 5W-40 or 0W-40 | 5W-50 (track use only) | Enhanced high-temperature protection |
Important: Never use viscosity grades heavier than 5W-40 in the M256 engine with integrated starter generator. Thicker oils can cause excessive wear on the ISG system and reduce fuel efficiency benefits.
3 Model Year Specific Information
3.1 2020-2024 Models (M256 Engine)
The M256 3.0L inline-6 turbocharged engine with EQ Boost represents a significant engineering advancement. Key oil system characteristics include:
| Component | Specification | Notes |
|---|---|---|
| Oil Capacity (with filter) | 7.9 quarts (7.5 liters) | Includes integrated starter generator circuit |
| Oil Filter | Mann HU 718/6 x or OEM A0001800101 | Cartridge style with integrated drain valve |
| Oil Change Interval | 10,000 miles or 1 year | Flexible Service System (ASSYST) determines actual interval |
| Special Requirements | Low-friction oil essential | Required for ISG system longevity |
3.2 2017-2019 Models (M276 Engine)
The M276 3.0L V6 biturbo engine has different oil system requirements compared to the newer M256:
| Component | Specification | Notes |
|---|---|---|
| Oil Capacity (with filter) | 8.5 quarts (8.0 liters) | Slightly higher capacity than M256 |
| Oil Filter | Mann HU 718/2 or OEM A0001800301 | Different part number than M256 engines |
| Oil Change Interval | 10,000 miles or 1 year | Same interval but different engine architecture |
| Special Requirements | Conventional synthetic acceptable | No ISG system constraints |
