Well, they come pre-lubed, but that worthless gunk washed out within a month. So I used the synthetic mobil 1 red grease, which isn't silicone from what I can tell, but it is synthetic. The bushings have actually broken in half on my rear lower control arm. I ordered a bunch of new ones from Spohn and am going to modify the bushings a bit to see if I can get some grease channels burned into the surface of the bushings. We'll see what happens, and I'll post my results
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