Quote:
Originally Posted by Qsilver7
Your X what?...3.0/4.4/4.6is/4.8is? You left no model/model year/build date nor which suspension system you have.
Remember to help us help you better by leaving enough information about your vehicle that we know what it is and how it may be optioned.
The e53 X5 has two different self leveling suspension...there's a rear axle only (EHC I) and a dual axle self leveling system (EHC II). There is nothing you can "add" to the system...since there's no reservoir to open and add anything. 
Since we don't know your model or which system...here's info on both types below:
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Man that one with adjustible ride height dash switch is badass!
That pic shows the 1 axle EHC module behind the compressor. It's not located underneath the spare tire and compressor housing along with the other module? I'm almost positive my EHC module is fried since I am getting no response in DIS/INPA. Fuses are good but going to recheck with my fluke.