Hi, I'm about to reach 92,000 miles on my 2006. Over the last year, a ticking sound has been getting noticeably louder. Now, when I'm in "idle" (standing still with engine charging battery), I hear a teka-teka-teka-teka sound. It's usually louder when I'm next to a wall with my windows down and it echoes, but otherwise it's not very loud in the cabin. I'm not a mechanic, but I've searched my problem, and researched "lifter ticks" and adjusting valves. It's obviously a huge deal to unseal a Toyota engine that was designed to stay sealed forever. And apparently adjusting the valves in the Gen II is also pretty difficult. I haven't noticed any performance or MPG problems, and the ticking doesn't drive me crazy, yet. So my questions are: -At what point, performance or noise level, should I take the plunge and have the valves adjusted? -Should I go to Toyota, or can Meineke do this (well)? Thanks!