Well I would have thought you should wind in the preloaders a bit before you even think about messing around with the oil, It only takes a minute and you do even get your hands dirty! Wind them both in a bit making sure the're even and see if it does what you want. ITS FREE! ( assuming its a k3/k4/k5 model and you have preload adjusters....) Changing the oil will effect the damping and wont make the springs stiffer....
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