You x is only 30K miles, there is no point to change the fluid and the filter at all. Do not do it, otherwise you may encounter lots of problems thereafter. Totally not recommended!!!!!! You might need to do it when your x reaches 150K miles, and ask BMW professionals to do it instead of yourself.

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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.