BMW Cooling System Flush
BMW does not have a schedule maintenance interval for coolant flushes. BMW’s Long-Term Antifreeze/Coolant does not contain nitrites or phosphates and has been formulated to prevent excessive silicate gel precipitation, significantly reducing the possibility of harmful deposit formation. Never mix BMW blue coolant with Preston or any over the counter antifreeze. If you are adding coolant, you probably have a coolant leak.
At Peak Auto in the Cary Apex NC area we believe that coolant needs to be flushed every 3 to 4 years. This Coolant maintenance item is important to perform when you want your coolant to do it’s job properly. We do not know why BMW does not include this service in the maintenance scheduled. We could joke that a water pump, radiator, or auxiliary temp gauge sensor will leak with in this maintenance interval forcing you to replace the BMW coolant anyway, but this does not sound very German.