Mercedes-Benz vehicles generally require antifreeze 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 actual replacement schedule should be based on usage. Regularly check the antifreeze level and top it up if insufficient. If suspended particles, sediment, discoloration, or deterioration are observed in the antifreeze, replace it immediately and flush the system. Antifreeze Replacement Procedure: Before a complete antifreeze replacement, conduct a thorough inspection of all hoses for leaks or cracks, with special attention to the five-way connector pipe (named for its five connection ports distributing antifreeze to different vehicle components). If leaks are detected at this junction, replace the hose or reseal the connection as needed. Drain the old antifreeze, then flush the cooling channels with clean water. Fill the reservoir with water and let it circulate continuously through the engine cooling system. Idle the engine for 3-5 minutes to activate water circulation. Initially, slightly pinkish water will drain out—continue flushing until the outflow runs clear. Remember to disconnect the heater hose and drain the heater core completely. Approximately one hour after draining, add new antifreeze through the radiator hose for rapid filling. Then pour another batch into the reservoir until nearly full. Run the engine for about 10 minutes; as air escapes from the system, the fluid level will drop. Top up to the "MAXT" mark on the reservoir.
