8th Generation Honda Civic Forum - View Single Post - SI with 87 octane gas *Threads merged*
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Old 01-31-2009, 01:13 AM   #186 (permalink)
p nut
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Join Date: Apr 2007
Age: 34
Posts: 107
Quote:
Originally Posted by bossman View Post
sooo...your suggesting that 85 octane is ok in an Si? I don't think so.If the put "use regular" gas in the manual or on the fuel door you would have that idiot that would think all gas is regular and that they should'nt use special gas.The MDX is'nt an Si and does'nt have an 11:1 static compression ratio much less the dynamic compression ratio of the K20 motor.
I'm saying that you CAN use it in an Si. It is RECOMMENDED that you use premium, but doesn't mean the end of the world if you choose 85. What makes you think that you can't? Most modern engines have knock sensors that automatically retard timing, so it's not going to blow up your engine if you use it.

The MDX has the same fuel recommendation.
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