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all the urethane parts ive ever used have lasted no more than a year.. they stiffen things up in the short term, but through extended use, theyve deformed quicker than rubber parts, leaving an element of slack after a while.. worst culprit was the rear torsion bar bushes i used.. the urethane one looked like the 26 year old rubbers they replaced after only a years use.. they allowed the springplate to move quite a lot.. i wasnt impressed so threw them in the bin and bought new stock rubbers.. these are still fine 4 years on... i guess urethanes are great for racing, where mileage is limited and parts are replaced more regularly, but on the street they just plain suck IMO..
PS: the fit of most urethane parts ive used is pretty poor too.. balljoint anti roll bar bushes especially.. they dont have enough material to go between the bar and the trailing arms, meaning the bar sits too close to the grub screws.. genuine rubbers fit much better...
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