No one has responded so I will take a crack. And this comes from no knowledge about the Avalon at all. I would be very surprised if there was a timing chain on the Avalon. Timing chains fell out of widespread favor a long time ago, mainly over noise issues. In the olden days, I don't remember recommended change intervals for the chains, I think you just waited for the chain, or mikely the nylon overmold on the cam gear that was supposed to reduce noise by quickly broke off, to break and replaced it. Chains really don't stretch, but belts do. Even with tensioners and other mechanical assistance, the belts have a life. And that is why the change interval is in the 60K mile range. As I said I have no knowledge of the Avalon but there's the generic answer.
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Does my 2005 toyota avalon V6 have a timing belt or a chain?
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