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Did you recently change your oil? Is oil level OK? What kind of oil/viscosity? What were the oil temperatures when you took the pressure readings? Are you burning any oil? Any weird whistling sounds? Excessive vacuum at the oil fill cap? Are you losing any coolant? Other possible changes in behavior between your 80k and 90k thresholds?
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John - 2005 C2S 997.1 at ~82k mi
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