In most GCC-spec Mercedes models common in the UAE, such as the GLC, GLE, and S-Class, the coolant reservoir is a translucent plastic tank located in the engine bay, usually on the driver's side (right side), marked with 'Kühlmittel' and Min/Max indicators. The primary rule for the UAE's extreme climate is to only use Mercedes-Benz approved coolant meeting MB 325.5 specification, which is formulated for high-temperature operation above 45°C, unlike generic brands. For a typical Mercedes GLE 400d used for daily Dubai-Abu Dhabi highway commutes, the annual cost of a professional coolant flush and refill at an agency is approximately AED 500-700, which is a minor but critical part of the vehicle's total cost of ownership (TCO) to prevent major engine overheating repairs costing upwards of AED 8,000.
| Aspect | GCC-spec Mercedes Recommendation (vs. Generic) |
|---|
| Coolant Specification | MB 325.5 (GSO 1791:2013 compatible) |
| Mix Ratio | 50% coolant, 50% distilled water |
| Average System Capacity | 10-12 liters for a V6/V8 |
- Critical UAE-specific note: Using non-approved coolant can void the warranty and lead to faster degradation under constant air-conditioning load and desert heat.
- Cost per km impact: Neglecting coolant maintenance can increase long-term running costs by 3-5% due to potential radiator and water pump failures.
RTA Dubai's vehicle inspection data highlights cooling system failures as a common reason for test failure during summer months. Furthermore, MOI UAE environmental regulations mandate proper disposal of old coolant at authorized facilities, as it is toxic. For a 2020 Mercedes-Benz, the annual depreciation linked to poor maintenance records can be significantly higher. Therefore, checking the coolant level monthly, especially before long trips in summer, and topping up only with the correct fluid is a non-negotiable practice for UAE owners.
