Xterra 2WD V6-4.0L (VQ40) (2005)
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Fuel: Service Precautions
Precautions for Fuel (Unleaded Regular Gasoline Recommended)
Use unleaded regular gasoline with an octane rating of at least 87 AKI (Anti-Knock Index) number (Research octane number 91).
CAUTION: Do not use leaded gasoline. Using leaded gasoline will damage the three way catalyst. Using a fuel other than that specified could
adversely affect the emission control devices and systems, and could also affect the warranty coverage validity.