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Originally Posted by Subie
It also says this on page 420:
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That doesn't specify which octane though.
Okay, it's right above that.
Quote:
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The engine is designed to operate at maximum performance using unleaded gasoline with an octane rating of 93 AKI (98 RON) or higher. If 93 AKI (98 RON) is not readily available in your area, unleaded gasoline with an octane rating of 91 AKI (95 RON) may be used with no detriment to engine durability or driveability. However you may notice a slight decrease in maximum engine performance and you may hear some knocking (pinking) of an engine while using 91 AKI (95 RON) fuel. Use of 91 AKI (95 RON) fuel will not affect your warranty coverage.
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So it does knock with 91 but it's still covered under warranty. That is a better explanation to me.