Hi Chris, for 4 factory struts to fail, in the seal area. You would have to have something that is bent, or out of line, to apply a bowing effect to the strut, as it works. This would load the top bush in the strut, wearing it to allow the seal to move and leak.
May be the lower trailing link is twisted, or the lateral links are twisted. Has to be in this area somewhere.
Harvey.
