BMW Repair Questions? Ask a Mechanic for Answers ASAP
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if the water level is dropping then there are only two options. 1) there is a leak 2) the engine is consuming it due to a blown headgasket, cracked head or cracked block. Leaks can be VERY hard to find so the cooling system needs to be pressure tested to see if the leak can be revealed. If no leak is found, then testing for a blown headgasket needs to be carried out
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