2007 Subaru Legacy type of gas

2007 SUBARU LEGACY
29,000 MILES • 4 CYL • AWD • MANUAL
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BDMILNE
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  • 1 POST
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
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2CARPRO JACK
  • ✓ASE Certified Mechanic
  • 11,533 POSTS
  • ASE Certified Mechanic
The engine management system has the ability to control the timing, so lower octane fuel will just cause the PCM to retard the timing a little to compensate, hardly noticeable performance loss unless being timed at the track
Apr 14, 2008 at 10:08 AM
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