Depending on your E30 (318 or 325e/i), BMW used one of three coolant reservoirs. In most cases, the main culprit is the level sensor. On BMWs with reservoirs mounted on the left or right wheel wells, BMW used a two wire sensor. If the reservoir is full and coolant low light is on, remove the level sensor connector and use a small piece of wire to connect between the terminals. If the light goes off the wiring is good, but the sensor is bad. For your question of what type of coolant to use. The main concern is that what ever brand you use (BMW, Everex, Peak, Prestone, etc), it MUST be phosphate free. This is a must because of the engine's cast iron block, aluminum heads, and the radiator's plastic/aluminum makeup. Today, most major brands are phosphate free and able to mix with other brands.
Big Boyz with Bad Toyz
Big Boyz with Bad Toyz.
Last edited by BigBoy740il; 12-01-2012 at 10:23 PM.