GT S197 General Discussion This section is for technical discussions pertaining specifically to the V8 variation of the 2005 and newer Ford Mustang.

octane for V8

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Old Jun 27, 2005 | 01:28 PM
  #1  
05gtrules's Avatar
05gtrules
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Default octane for V8

what gas is everyone using in their GT's? I keep hearing that premium will leave deposits in your engine... The manual calls for regular, but I'm just curious what would truly be best for it. Thanks. Oh, also, Synthetic oil worth it?
Old Jun 27, 2005 | 02:36 PM
  #2  
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Default RE: octane for V8

from the factory, the GT calls for regular but once you start adding mods and the performance tune, you will need to upgrade to supreme
Old Jun 27, 2005 | 02:50 PM
  #3  
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Default RE: octane for V8

Can't comment on the gas as of today, but I do plan on running 91 octane when I add my new tune later this summer. I am a strong believer in Synthetic oils though. The oil is the life blood of your engine. Why would you not run the best oil you could buy? You wouldn't buy a cheap parachute or cheap SCUBA gear would you? You think the guys driving the high end exotics are running Quarker State? I vote "yes" on your Synthetic question.
Old Jun 27, 2005 | 05:44 PM
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Eric @ DMS
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Default RE: octane for V8

I always run supreme on our Mustangs, Fbodies, and Vettes (that aren't our race specific vehicles). The higher the octane the less chance of pinging etc.
Old Jul 2, 2005 | 08:41 PM
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welshstar
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Default RE: octane for V8

Hi

What polish do you use ?

Car looks great !!

Steve
Old Jul 2, 2005 | 09:37 PM
  #6  
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Default RE: octane for V8

what about 95 or 98 octanes then??? will that damage the cars engine?? because then everyone in europe that ordered one will be screwed lol....
Old Jul 2, 2005 | 11:52 PM
  #7  
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Default RE: octane for V8

Thx for the info, I was asking the same question.

[IMG]local://upfiles/17396/6D0A128642C0441394CA02BDAA71CB42.jpg[/IMG]
Old Jul 3, 2005 | 01:42 AM
  #8  
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Default RE: octane for V8

I ran 87 until I put the CAI and Predator 91 tune in it.
Old Jul 3, 2005 | 03:34 AM
  #9  
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Default RE: octane for V8

Once again, your GT is set up to run on 87 octane. If you do mods, specifically engine mods, like Supercharging or Turbo, then follow the part manufacturer's recommendations.
Unless you have 20-30 cents/gallon to waste...
Old Jul 3, 2005 | 08:31 AM
  #10  
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MackinMike
 
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From: SWEDEN
Default RE: octane for V8

GOD you americans always bitch about how much it costs to fill up your car. how do you think we feel in europe. i pay over $60 to fill a car here! my cousin in norway pays $100 to fill. ANYWAYS my baby is coming soon. have about $50,000 to put into the car. just not sure what the hell to do with it when i get it. guess we will see



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