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Old Nov 24, 2009 | 12:34 PM
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iamxeddiex
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FL fuel!
What is the best fuel octane to use in a 87 n/a?
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Old Nov 24, 2009 | 12:36 PM
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any, the compression is so low i don't think it matters. just make sure your oil injectors are working. s4 n/a has something like 9.5:1
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Old Nov 24, 2009 | 02:08 PM
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N/A work better on lower octane gas, if you premix your oil it lowers the octane even more, gets a bit more kick out of the car IMO. If you got a turbo 91+ is a must.
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Old Nov 24, 2009 | 03:17 PM
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Compression is higher in N/A's
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Old Nov 24, 2009 | 03:28 PM
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Lower the better for N/A.
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Old Nov 24, 2009 | 05:49 PM
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Lower octane produces more power in NA
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Old Nov 24, 2009 | 06:26 PM
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Originally Posted by Jzavala
any, the compression is so low i don't think it matters. just make sure your oil injectors are working. s4 n/a has something like 9.5:1

9.4:1 compression ratio in a S4 .

To the OP:

Just use 87 as Mazda intended.
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