On the e70, the air springs are easier to change than the headlight bulbs! Easy access from below just take off the wheel cut a hole in the old one to help collapse it cut the air supply line plug the line in the new spring and twist the new one 1/4 turn bayonet style to lock it in. No tools (save the utility knife and lug bolt tools and Jack)

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)