Frontier 2WD L4-2.5L (QR25DE) (2005)
Fuel: Specifications
Fuel Requirements
Use unleaded 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.