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ok, he's dead wrong. Everything is not hot after 30 seconds. But you don't need to sit there idling until the temp gauge reads normal either. The current common school of thought is to go ahead and drive after you start it - the increased hydraulic pressure from putting the load on the motor will actually help the oil get to the top of the engine faster.
The trick is to drive GENTLY until 5 minutes AFTER the needle indicates operating temperature. You wait the extra five minutes to be sure the oil is warm enough - remember that the needle is showing you the water temperature, NOT the oil temp.
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