How Often Should the Coolant Be Replaced in a Mercedes-Benz E-Class?

[LaCarlos]

Mercedes-Benz E-Class vehicles generally require coolant replacement every 2 years or 40,000 kilometers. This is just a reference interval. For commercial vehicles with higher mileage, the replacement cycle should be shorter. Since driving conditions vary for each vehicle, the replacement should be based on actual usage. Regularly check the coolant level and top it up if it is low. If suspended particles, sediment, discoloration, or deterioration are observed in the coolant, replace it immediately and flush the system. Coolant Replacement Procedure: Before a complete coolant replacement, conduct a thorough inspection to check for leaks or cracks in all hoses, with particular attention to the five-way hose. The five-way hose, named for its five connection points, distributes coolant to different parts of the vehicle. If coolant leakage is detected in this area, replace the hose or reseal the connections as needed. Drain the old coolant, then flush the system with clean water. Add water to the coolant reservoir and continue filling until clean water flows continuously through the engine cooling system. Start the engine and let it idle for 3 to 5 minutes to circulate the water. Initially, the drained water may appear slightly pink. Continue flushing until the water runs clear. Remember to disconnect the heater hose and drain the heater core completely. After draining for about an hour, add new coolant through the radiator hose to allow quick filling. Then, fill the coolant reservoir with another batch of coolant until it is nearly full. Run the engine for about 10 minutes; as air is purged from the system, the coolant level will drop. Top up the coolant to the "MAXT" mark on the reservoir.