I have a 2.5 liter turbo legacy spec b that I purchased used. The salesperson said unleaded plus (890 octane) is ok to use. However, the service department said to use only 91 octane because of the turbo. I do not push the car, am a conservative driver. What will 89 octane do to the engine? I ask because i can get 89 octane at the same price as unleaded at Kwik Trip gas stations.
Apr 14, 2008 at 4:30 AM