5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Which octane?

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Old Feb 17, 2006 | 06:42 PM
  #1  
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billyboy1955
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Default Which octane?

What octane gas should I be using in my 90Gt. I have tried them all but do not feel a difference.
Old Feb 17, 2006 | 06:44 PM
  #2  
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Default RE: Which octane?

If u wanna bump the timing up a bit, you will need to run higher octane, if your timing is set at 10, then regular is fine.
Old Feb 17, 2006 | 06:46 PM
  #3  
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Default RE: Which octane?

Bump timing/highter octane = more power
Old Feb 17, 2006 | 06:48 PM
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Default RE: Which octane?

higher octane is more or less like a fuel injection cleaner. The higher the octane you go, the hotter you run the engine. If you have a stock stang, dont waste money on higher octanes, your car will run just fine on 87
Old Feb 17, 2006 | 06:57 PM
  #5  
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Default RE: Which octane?

The higher octane helps prevent detonation, so it won't help you unless you've bumped your timing up past 13-14....
Old Feb 17, 2006 | 07:55 PM
  #6  
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Default RE: Which octane?


ORIGINAL: RawGtPower

higher octane is more or less like a fuel injection cleaner. The higher the octane you go, the hotter you run the engine. If you have a stock stang, dont waste money on higher octanes, your car will run just fine on 87
Sorry but this is wrong. Here read this if want to actuall know about octane and not just what some guy on the 'Net thinks it is.
https://mustangforums.com/m_1019975/tm.htm
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