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Originally Posted by donv
The reason I've heard for not using the stands is that you end up inviting rust in areas that normally aren't exposed to air/corrosion when the suspension is loaded.
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Hi,
You're quite right so far as you go. When the suspension is left hanging, the struts expose a greater portion of the piston shaft than usual. This steel will corrode and then tear the seals on the shock body once they're pushed back into it.
But, the other reason is that the suspension bushings will be stretched and contorted in a manner contrary to their normal use. The Bushing material, Rubber or Poly has a memory and will tend to take on this new shape giving the suspension much more play, the same is true, albeit less so, for the torsion bars (anti-roll bars). So, it's not a good idea to unspring the car for long periods, especially in colder temperatures. Hope this helps...
Happy Motoring!...Jim'99