91 octane fuel? - Kia K900 Forum
 
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post #1 of 5 Old 10-10-2015, 11:53 PM Thread Starter
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Default 91 octane fuel?

How many of you use only 91 octane fuel?
Looking in the manual I find this on page 1-3
The 5.0 engine was designed to run on unleaded
fuel having an octane rating of 87 for improved
performance use 91 octane.
87 octane top tier gas seems a better choice than just
any old 91 octane
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post #2 of 5 Old 10-12-2015, 05:26 PM
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I have the V6 and i use 89 with 10%R ethanol and I have no problems at all




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post #3 of 5 Old 10-12-2015, 07:08 PM Thread Starter
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KIA ads say use 91 octane in the V-8, but manual says it is designed to run on 87 octane, better performance with 91 octane
That is only the V-8 . the V-6 says use 87 octane
I have tried both and don't see any difference, except in my wallet
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post #4 of 5 Old 10-13-2015, 01:50 PM
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I have always found that. My wife's mini cooper calls for 91+ octane and its leased so when she fills it up ( rarely) she uses hight test when I fill it up I use 87 .She has not noticed any different although her driviong is very little . Owned 18 months 3500 miles on Odometer




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post #5 of 5 Old 10-13-2015, 08:22 PM
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I always use 91 in every car, but especially a V8 engine.

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