Proper lubrication of polyurethane is critical to eliminate squeaking. By utilizing a waterproof high temperature high pressure and highly adhesive silicone based grease Super Grease will keep your polyurethane bushings quiet just like they should be. 14 OZ Tube of Super Grease. Ideal for use in grease guns to lube the polyurethane bushings in your Hotchkis Sport Suspension Products. 14 OZ Super Grease. Ideal for use in grease guns to lube the ployurethane bushings in your Hotchkis Sport Suspenion Products. Universal