Oh yes, those plastic Behr radiators scare me. I'm keeping a close watch on mine. Getting back to the guide. I think I have the original chain & guides in my car (288,000) Comparing the new chain with the old, there's hardly any noticeable stretch-about 1/8 inch on the whole length. Worst part of the whole system is the galling between the tensioner pin & the guide pin. I would just like to see what an old guide with the rubber coating looks like after 100,000 miles. Thanks for the replies, Paul.