Exactly and coolant is one thing you don't want a substitute for bmw's you should use water for now and then top up with the original coolant.
30+ Top Up Coolant Bmw 3 Series
Pictures. Topping off coolant, adding engine oil, approved engine oils, checking coolant level. Bmw x3 2005 manual online:
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Look at the coolant reservoir tank and note the low and high levels. Infact you could run on distilled water alone if you wanted if you were only in warmer weather. Get the coolant topped up, run the car a bit, and check it again once it's cooled down.
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Glycol based coolant will work, most dealers sell top up quntities. It appears to be coming from a large. I have to fill up the radiator everty time before i leave for town. Is there something about the parts in the bmw cooling system that makes it neccessary to use this more.