You should be looking for leaks (gas gushing out NOT air in) that way you can be more sure that you found the problem(s) (maybe the lower fitting is leaking as well) and can be sure when/if you have them fixed.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)