Break in 87 or 91 Octane - Mustang Evolution

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Old 06-03-2013, 07:26 PM   #1
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Break in 87 or 91 Octane

Hi I just got a 14' GT last Friday and would like to know what fuel octane I should use for the first 1,000 miles. The owners manual says that 87 is recommended, but in extreme temperatures or high performance driving 91 should be used. Which one should I use?
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Old 06-06-2013, 09:44 AM   #2
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Originally Posted by ford302ize View Post
Hi I just got a 14' GT last Friday and would like to know what fuel octane I should use for the first 1,000 miles. The owners manual says that 87 is recommended, but in extreme temperatures or high performance driving 91 should be used. Which one should I use?
With the break in of an engine I've always heard to take it easy and lug the motor a bit, not really any high rpm drives, and I would say 87 would've good for the break in. After that if you wanted to switch to 91 it would be good
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Old 06-06-2013, 03:51 PM   #3
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Aww.. too late for me, I didn't read that.. I started using 91 from the beginning.. I wonder what the dealer put in it since they filled it up for me when I bought it..
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Old 06-06-2013, 05:27 PM   #4
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Aww.. too late for me, I didn't read that.. I started using 91 from the beginning.. I wonder what the dealer put in it since they filled it up for me when I bought it..
Dealer likely used 87
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Old 06-06-2013, 05:35 PM   #5
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Dealer likely used 87
+1
dealers are in the business to make $ and most try to get out with spend the least amount of their own $ as possible.
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Old 06-06-2013, 06:00 PM   #6
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There's a thread about this exact same thing in the 10-14 section. In a high compression motor like the 5.0 I would never run less than 91.

Just because the ecu can ****** timing and "allow" you to use 87 octane doesn't mean you should. It's a bandaid fix for using cheap/low octane gas that will lead to long term damage and faster wear
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Old 06-06-2013, 07:05 PM   #7
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Dealer likely used 87
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+1
dealers are in the business to make $ and most try to get out with spend the least amount of their own $ as possible.
Well then at least it had 87 for the 1st 300ish miles(car came with 100 miles already...)
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