I have to assume the T40 comment was for the tensioner bolt and the T45 was for the set bolt. I was a while ago I played with the tensioner.

I never found anything that indicated the belt was a stretch belt, but I recall I found the tensioner fully adjusted. I ran my tensioner in quite a bit, but do not recall bottoming it out.

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2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim.