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Allowing the suspension to hang exposes sections of the strut shaft that are normally inside the strut when the car is on the ground. Left exposed too long, these can develop corrosion that then ruins the seals inside the strut housing when the car comes down, resulting in strut cartridge leaking and failure. And before you ask, no, you cannot get at the shaft to spray protectant on them; they are covered by the strut boots.
If the car is inside a temperature-controlled, dry facility, the car can be up in the air for quite a while before this develops. If the facility is unheated or damp, the time frame becomes much shorter.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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