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2007 Subaru Legacy type of gas

Tiny
BDMILNE
  • MEMBER
  • 2007 SUBARU LEGACY
  • 4 CYL
  • AWD
  • MANUAL
  • 29,000 MILES
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.
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Monday, April 14th, 2008 AT 4:30 AM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
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
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Monday, April 14th, 2008 AT 10:08 AM

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