8th Generation Honda Civic Forum - View Single Post - SI with 87 octane gas *Threads merged*
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Old 01-17-2009, 01:48 PM   #174 (permalink)
OrdnanceMarine
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Join Date: Feb 2008
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David
Keep in mind Honda just needs the engine to last 36,000 miles and then you're on the hook for repairs. The Owners Manual states that, "Use of a lower octane gasoline can cause occasional metallic knocking noises in the engine and will result in decreased engine performance." I can't imagine "occasional metallic knocking noises" are the path to engine longevity, even though the engine may still last way past warranty.
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