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View Poll Results: Do you use 91 octane in your SVT at the Pump?
Yes, I use 91 every time I fill up 110 46.41%
I use 91 sometimes when I fill up 7 2.95%
I never use 91 13 5.49%
I use higher than 91 107 45.15%
Voters: 237. You may not vote on this poll

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Old 11-06-2006, 07:53 AM   #1
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Question Svt Owners! 91 Octane, Yes? No?

I wanted to get a rough idea how many people use 91. You may now we are still considering getting a SVT.

I wanted to know also if someone (previous owner) doesn't use 91 is it harmful?

Thanks
Logan

EDIT: People have been asking if i am talking about using 91 Ocatne or highier.
I am talking about 91 only because thats what the dealer says and has labled things as.

NP


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Old 11-06-2006, 08:15 AM   #2
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except when the dealership decided to get me a free tank of 87 (yeah way to go) I only use 91+. I look at it this way I will spend the extra 3 bucks it costs to fill up with premium. I am always a strong advocate of putting in what the factory specifies.

The guages state to use premium only not like my 91 Taurus SHO that says premium recommended.
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Old 11-06-2006, 08:17 AM   #3
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i use premium every time i fill up, i don't think using regular or midgrade will harm the motor but as far as warrenty issues i KNOW the dealership would say that whatever is wrong was due to not using the proper octane level gas or something stupid like that, besides it's a 13gal tank even with the .20c increase from regular it still costs way less to fill up then most cars on the road anyways
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Old 11-06-2006, 10:03 AM   #4
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You really should. The engine is calibrated for the higher octane even stock. Theyre not kidding when the sticker says it in the fuel door. If you dont, it causes detonation which can be harmful to the internals.
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Old 11-06-2006, 10:22 AM   #5
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well they dont sell 91 octane in my area (I live about 5 mins away from "If you lived here you'd shoot yourself") the typical grades are 87,89,93 so i use 93..one time i got a bad tank of 93...threw a check engine light...bad times right there; engine ran mad rich, got horible gas milage, and i was shifting no later than 3k to keep from hurting anything or running into detonation....moral of the story kids, use what the factory specifies, or something better, and don't get gas right after a station replaces thier tanks...you will regret it...
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Old 11-06-2006, 10:23 AM   #6
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i have put in nothing but 93 at the same pump ever since i got the car. since 8/06
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Old 11-06-2006, 10:47 AM   #7
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Wouldn't even think about putting anything but 91 or higher in this car... I've only used 91 octane since I've owned it. I can't get 93 here in CA. There's a reason the manufacturer puts "use only 91 octane" on your gas cap.
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Old 11-06-2006, 10:53 AM   #8
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91 is the MINIMUM you should run.
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Old 11-06-2006, 10:57 AM   #9
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no choice. That's all I have available in California. I'd go higher if I could.
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Old 11-06-2006, 11:14 AM   #10
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I get indignant when the best "premium" I can find is 91 octane. Most places in new england serve up 93, which I'm tuned for anyway.

FWIW, I read a lot of discussion about a year ago when the SVT was new to me, a lot of people apparently report using lower octanes with great success. Part of the reason for this probably lies in the actual compression ratio of the SVT Zetec; I read (and I dont remember where) that the quoted 10.2:1 is on the low range of what actually ends up being put together. Due to tolerances I suppose, the factual CR range is 10.2-10.6, which is a big difference, and could also explain why some SVTs baseline dyno so much better or worse than others. 89 or 87 is probably fine at 10.2:1 if you're running a little rich. I still wont gamble it for a measly $2.xx saved and a likely power loss. You ask me, somebody who ponied up the cash for an SVT has already forfeited their chance to pinch pennies.
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