F20 M140i Coolant loss
Low coolant light came on and on checking the larger of the two expansion tanks had to add 800cc to bring level up to Max. Over the course of two weeks had to continue adding coolant with no obvious sign of leaks. Oil cap has no sign of emulsion ie. water contamination. After adding almost 2000cc to maintain level put car into BMW who did a pressure test and checked all over for any sign of leak with good test and no leaks observed. BMW topped up to 200cc above Max level and all appeared good. BMW had no answer as to why I kept having to top up. Having check level every 2 to 3 days for 2 weeks thought everything was OK. Then 3 days ago the low warning light came on and required 800cc to top up. The car has consumed 3000cc of coolant having driven 1135 mls. I know this is not normal but BMW had no answer other than the pressure test was OK.
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