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Message: <blockquote data-quote="mick123" data-source="post: 469816" data-attributes="member: 19337">hi all sifus,just want to check if the coolant in the expansion tank do drop after filling to the brim? Mine drops to around the level of the "shinny ring" after 1 1/2 months or about 3000 km. is this normal or is there a leak somewhere?previously, the level dropped to that level after 1 week after a change of radiator and my mech did a pressure test and found a tiny leak at the brand new radiator.mine is a E39 525 '01.cheers!<img src="http://i301.photobucket.com/albums/nn63/cclkl/IMG_0091.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i301.photobucket.com/albums/nn63/cclkl/IMG_0092.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>