These engines seem to be very hard on oil. I had a similar thing happen last summer, with one lifter that was suddenly loud enough that I thought I had a serious problem. An oil change seemed to cure all its ills. Give it a shot and see. I personally don't trust any of the additives.
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'03 S, manual, 18" Carrera wheels, PSM, PSE, Litronic, 996 Cluster, +
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