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On my 2003 S I had that once too, in the fall of 2012 at about 35,000 miles. Sounded like the engine was going to blow up so I shut it down and had it flat bedded to my independent specialist. The noise was a really horrible metal on metal shriek, scared the crap out of me. They looked it over, saw nothing and manually turned over the engine and everything looked fine. So then they started it up and it was perfect. They concluded it must have been a lifter. It's never happened again. At 42,000 miles I decided it was time to do the IMS, the original one was fine but after that noise I decided I would sleep better knowing that had been addressed.
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