Not saying that this is the medication but sometime it's just the clamp to replace.
It happend to me last month when I had some leaks from a few places. Mine is a 2006 with 70 miles and the hoses are in a good shape but the clamps were lose...My mechanics changed them all... No more leaks.

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2006 X5 4.4i premium, Sport package ,Winter Package, Sat Nav. AFE Power stage II Production : 08-2006
2012 BMW 128I Convertible Black
2011 Mercedes Benz B200 sold