Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Mercedes Benz GLS450FACTORY OEM SERVICE PROCEDURE
Quick Lookups: Fluids
| FLUID CAPACITIES | |||||||
|---|---|---|---|---|---|---|---|
| Fluid Type | Application | Standard | Metric | Fluid Spec | Note | S/H | |
| Air Cond Compressor Oil | 3.90 OZS. | 0.11 L | PAG Oil | Only use products recommended by Mercedes Benz. Approximate capacity. | S | ||
| Air Cond Refrigerant | 2.30 LBS. | 1.04 KG | R-134a | For further details see "Air conditioner specification label". Approximate capacity. | S | ||
| Automatic Transmission Fluid | 10.57 QTS. | 10 L | Automatic Transmission Fluid D971 (Color of Transmission Oil: Gold) | Only use products recommended by Mercedes Benz. Approximate capacity. | S | ||
| Brake Fluid | 0.53 QTS. | 0.5 L | Brake Fluid (DOT 4 plus) | Only use products recommended by Mercedes Benz. | S | ||
| Engine Coolant | 10.30 QTS. | 9.74 L | MB Anticorrosion/Antifreeze | Only use products recommended by Mercedes Benz. Approximate capacity. | S | ||
| Engine Oil | w/Filter | 8.90 QTS. | 8.42 L | MB Approved Synthetic Engine Oil - SAE 0W-30, 5W-30, 5W-40 or 0W-40 | Use Mercedes-Benz approved engine oil only. See bulletin No. S-0473-08B (Mercedes-Benz Factory Approved Service Products). | S | |
| Fuel Tank | 23.80 GALS. | 90.09 L | Reserve tank capacity: 3.2 gals. | S | |||
| Transfer Case Fluid | 0.72 QTS. | 0.68 L | MB Transfer Case Fluid | Only use products recommended by Mercedes Benz. Approximate capacity. | S | ||
| Windshield Washer Fluid | 5.50 QTS. | 5.2 L | MB Windshield Washer Concentrate "MB Summer Fit" and water for temperatures above freezing or MB "MB Winter Fit" and water for temperatures below freezing. | S | |||
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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