I have a 1999 323I

either is antifreeze or is the oil light.
cooling tank is in the front of the car. look for a fan, the cooling tank is infront of the fan. open the cap (make sure the car is cold). and see if there is water or antofreez in it. add as you needed. also follow a tube from the side of the filler neck. you should see a container, that should be a over flow container. fill that to the line on the container. close the cap. and make a 90 degree turn. it should be tight.
the oil is on the button of the engine. you should see a dip stick with a color handle near the engine. pull it out and use a paper towel clean it, put it back and pull it out again. take a look at the tip of the stick. there should a marking indicating where the oil should be. half qt of oil if dip stick shows half way between the mark, and full qt if the dip stick indicated below the marker. fill the engine (filler is on top of the engine.) with oil.