Subaru BRZ 2018 Owner's Manual page 81

STEP 3
Closing the fuel tank cap
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Fuel types
Unleaded gasoline (93 AKI [98 RON] or higher)
If unleaded gasoline with an octane rating of 93 AKI (98 RON) is not avail-
able, unleaded gasoline with an octane rating of 91 AKI (95 RON) may be
used with no detriment to engine durability or driveability.
Hang the fuel tank cap on the
back of the fuel filler lid.
After refueling, turn the fuel tank
cap until you hear a click. Once
the cap is released, it will turn
slightly in the opposite direction.
1-5. Refueling
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