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Discussion Starter #1
To all,

I noticed the SpecV recommends Premium fuel so why doesn't the new Altima? The engine is the QD25 and the horsepower is the same so I wander what the deal is. I would think the car would run best with Premium but hasn't anyone tried the mid grade (89) octane?
 

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HYDYST?
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I thought there was a HP difference, only 5hp or so. That could be from tighter tuning needing higher octane. Or they may just think Spec-V drivers will be harder on the motors and are just adding some insurance.
Just some thoughts.
 
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Discussion Starter #3
No, HP rated the same for both (175) which I hear is too generous.
 
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I've used the mid-grade (89) a few times in my Spec V, with no complications. I really believe that this is entirely a performance issue. If you want the most performance/HP from the motor, use the highest octance. I don't think that using lower octane fuel at times will harm the engine in the long run.

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2002 Spec V
1997 200 SX SE
 
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