2007 BMW 7 Series Owner's Manual - Page 212

Under the hood Coolant Do not open the cooling system when the engine is hot. Escaping coolant can cause burns.< Coolant consists of water and supplemental antifreeze and anticorrosion agents. Not all commercially available additives are suitable for your BMW. Ask your BMW center for suitable additives. Only use suitable additives; otherwise, engine damage may result. The additives present a health hazard; follow the instructions on the containers.< Always follow all applicable environmental laws and regulations when disposing of used coolant additives.< Checking coolant level 1. Allow engine to cool. 2. Turn the cap of the expansion tank counterclockwise to allow any accumulated pressure to escape, then continue turning to open. 3. The coolant level is correct when the coolant extends to between the MIN and MAX marks on the filler neck, refer to the diagram adjacent to the filler neck. 4. If the coolant is low, slowly add coolant up to the specified level - do not overfill. 5. Twist closed the cap and tighten firmly. 6. Have the reason for the coolant loss eliminated as soon as possible. 210 Online Edition for Part no. 01 41 0 013 316 - © 02/07 BMW AG