How long to warm up a 10 year old Boxster?

[ammonman]

Start the car, put it in gear and drive off. Keep the rpms below 3500-4000 until the coolant starts to get warm then drive like a Porsche should be driven. As others have said, extended idling isn't good for any car.

Mike

[jsceash]

When the engine is cold I see oil pressure about 25 to 30 PSI higher than normal. I leave it idle until they stabilize in normal running range.