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I should clarify, maybe preload isn't the correct term. You just don't want your bushings to be constantly binding.
It's pretty straight forward. You loosen up the bolts where you have a bushing that is bonded to an inner metal sleeve. Jack up that corner so the suspension is loaded up (you want to get it around your new ride height) and then re-torque all the bolts you loosened.
From the factory the bolts that go through bushings are tightened down at the ride height. Now that you've lowered the car, the position of the suspension arm changes. Since the arm or suspension is tightened against the metal sleeve in the bushing, the sleeve in the bushing now twists causing way more load on the bushing (placing it in a binding position). Which will cause it to fail early.
Hopefully that makes sense?
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