Greetings, o wise and mighty Toyota gurus. I own six (6) 1958-2012 Land Cruisers, but my sister in New Mexico has owned a 2006 Sequoia since new; it presently has about 55,000 miles on it. A local mechanic has advised her to replace her timing belt as a precautionary/maintenance measure, although the vehicle is exhibiting no symptoms. Now I seem to recall a friend, who had that same V-8 engine in his LC, whose timing belt broke -- with catastrophic consequences. Please share your expert thoughts/judgment regarding proactive/preventative replacement of the Sequoia's timing belt at 13 years/55,000 miles.