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On all the water cooled cars from 99-08 there is a (small) possibility of a blade or two breaking off the water pump impeller. The little bits circulate through the water passages and can become lodged in the head(s) and cause a hot spot/localized overheating/cracks and then intermixing of the oil and coolant. Some advocate changing out the water pump every 40,000-50,000 miles.
Also, rare instances of cylinder scoring, rod bolts breaking and tensioners failing.
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Kurt
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