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If the ticking noise is heat related, you won't hear it on short drives. If the first time you drove it the engine was cold and only took it for a few miles, it probably never got up to temp. For me, the ticking was also more pronounced on cold weather days.
Next time you test drive, make sure you get the temperature gauge up to operating temp for a bit, then get on the highway and run a couple miles at high RPM. Go back to the shop and listen for the sound.
Personally, I've never had the ticking generate any other problem, but it is annoying and kind of embarrassing (hate squealing breaks too). I've had enough other problems however, that I'll never buy used again though.
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