Where is the drain screw on the BMW 730?

[JudahRose]

The drain screw on the BMW 730 is located inside the engine cover. Introduction to the BMW radiator: The BMW radiator is a heat exchanger for the water-cooled engine, which maintains the normal operating temperature range of the car's engine by cooling through air convection. If the engine coolant in the BMW radiator boils and vaporizes, causing the pressure in the engine to exceed the set value, the radiator cap will release the excess pressure to prevent the cooling system pipes from bursting and to reduce coolant loss. Maintenance of the BMW drain screw: The drain screw in the BMW radiator should not come into contact with any acids, alkalis, or corrosive substances. It is recommended to use soft water; hard water should be softened before use to prevent internal clogging and scale buildup in the radiator. When using antifreeze, always choose a high-quality, long-lasting rust and corrosion inhibitor antifreeze produced by reputable manufacturers and compliant with national standards to avoid radiator corrosion.