I have a 325I 2003.
I wanted to put coolant in my car and I started putting it in the reservoir. But I wasn't sure if that is where i put it so I stopped.
Will it hurt if I put a little in the reservoir and if the needle in the radiator is already top-off should I wait till it need some? A friend of mine did some work to the car and he said the water was really low. So for a temporary fix he put water. But told me that I needed coolant.