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One key aspect to running polyurethane bushings is that they need to be greased. Unlike rubber bushings, the Energy polyurethane bushings will sound like you have a squawking parrot under your ride if not properly greased. Energy supplies you with their Formula 5 Prelube, a special type of lubricant that is long-lasting, waterproof, and keeps the squeaks away. Before the bushings were put in, the control arm housings were lubed up.