I originally included this question in a different thread and didn't receive a response on this topic. I am reposting it as a new thread hoping to get a response.

I have read a lot on this forum concerning the aging and break down of the material used to make the chain guides and the importance of changing them as they age. I haven't however seen anyone talking about (nor do the achieves contain) any experiences with slide rail failure. The guides on my car look new but the slide rails behind the timing case cover are very dark brown. Obviously these are no picnic to change out because the necessity of removing that timing case cover (and everthing in front of it) complicates things. But if the guides are prone to failure than I would assume that the slide rails are too. Has anyone had any expience with slide rail failure or replacement?? Do I have more important things to worry about than the slide rails??

Randy