I found this.
Originally Posted by Kwame@z1
The Noltec bushings are polyurethane (essentially the same as urethane). Not to be argumentative but as far as your experience, it really comes down to the quality of the bushings you use. There are crappy polyurethane bushings and excellent polyurethane bushings. For example, we have been running polyurethane bushings in Adam's 600+hp 280zx for over 10 years without any issues and thats just one of the shop cars that we have completely outfitted with urethane/polyurethane bushings without any issues.
I have recently ordered all of the Noltec (Noltec, Whiteline and Nolathane were all bought out by Red Ranger and are the same company. Noltec = Whiteline Plus) bushings for my car. I wont be able to post a review for some time however due to the fact that the rear subframe bushings wont be in the U.S. for some time.
For anyone looking to purchase any of the bushings we have a of couple sets available, with the exception of the subframe bushing
Front Bushings:
http://www.z1auto.com/prodmore.asp?mode ... rodid=3783
Rear Bushings:
http://www.z1auto.com/prodmore.asp?mode ... rodid=3784