Quote:
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Originally Posted by Your Owner's Manual
Fuel Recommendation
All models except Si
Your vehicle is designed to operate on unleaded gasoline with a pump octane number of 87 or higher. Use of a lower octane gasoline can cause a persistent, heavy, metallic rapping noise that can lead to engine damage.
Si Model Only
Your vehicle is designed to operate on premium unleaded gasoline with a pump octane of 91 or higher. Use of a lower octane gasoline can cause occasional metallic knocking noises in the engine and will result in decreased engine performance. Use of a gasoline with a pump octane less than 87 can lead to engine damage.
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To summarize.
For the R18, use of lower than 87 octane can damage your engine.
For the K20Z3:
- Use of lower than 87 octane can damage your engine.
- Use of greater than or equal to 87 octane and less than 91 octane can decrease performance (and cause an occasional knock).
The owner's manual doesn't give a fuel recommendation for modified cars.
-mr. bill