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Could be any of the mentioned above, the water pump, AOS or alternatively a loose spark plug.
Try removing the oil filler cap while the engine is running - if its difficult to remove (ie a strong vacuum), the chances are your AOS has gone.
It would be a good time to check for error codes if you have a scanner....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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