Probably the fith cylinder lifter. Iv'e had 86 000 mile cars do it and 210 000 mile cars that didn't, but the ones that did the noise would come and go, and some sounded like the engine was ready to give in but never had a problem. I was told by a mate who has been buying, selling and running audi's for over 20 years that the fith cylinder lifter doesn't get enough oil, and he also told me audi stripped a high milage engine with this fault to find no damage at all, which in my experiance is probably right as i have "driven em like i stole em" and never had any mechanical faliures at all.
Bryan
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