If you've noticed some clunking or rattling noise coming from underneath the driver's side of your car when going over small bumps or potholes, chances are you need new compression rod bushings. I have read that this is somewhat a common problem with the Infiniti g35s. (Defective bushings). The bushings are hard rubber-like fittings near the end of the compression rod. When the bushings are cracked (from age and wear and tear) they usually make for rattles underneath your car. Metal hitting metal and no longer cushioned by the rubber bushing. I am told this condition is not critical to suspension safety, but should be replaced, perhaps due to causing more problems down the road. See your local mechanic if you have one. He or she will most likely be cheaper than an Infiniti dealer. In addition, only the bushings need replacing, not the entire compression rod - as many dealers oftentimes like to replace both the rod and bushing. A quicker fix? However, this only adds to the cost of the repair. How long can you drive with this condition? Can't honestly say. My advice? Change 'em. Bite the bullet. You'll rest easier knowing you've resolved the problem.