Mr Stoltenberg engages one passenger on education, saying: "The main point is to make sure good students have something to stretch for, and to give those who struggle extra help."
None of the passengers was charged for the ride.
Mr Stoltenberg told the VG newspaper: "I'm pretty well known in Oslo, but I tend to sit in the back seat."
The Labour prime minister came in for criticism for his driving, at one point jolting the car abruptly when, he said, he mistakenly applied the brake pedal on the automatic car, thinking it was the clutch.
He said he had not driven in eight years.
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