Very interesting, I found that my front air bags held very well in recent weeks. After overnight (over 10 hours) sitting in garage, both front left and right air bag hold pretty well. One thing I found that, after overnight sitting, both front left and right drop a little bit but not noticable, I guess maybe only 5mm. Is it normal or it just leaking very very slowly? What is your suggestion? Should I still go changing both front left and right air struts or just hold until significant leakage found?

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--2004 E53 X5 4.8is - ECE version; right hand drive; Located in Hong Kong; ext. black sapphire metallic; int. leather black; adaptive dynamic bi-xenon headlights; 16:9 onboard monitor w/o navigation; 20" genuine BMW Y-spoke 214 wheels with Bridgestone Dueler H/P Sport tires; Int. rear view mirror w/ compass.