Fuel Information; Fuel Tank Opening For Unleaded Gasoline; Gasoline Quality - Lexus GX 460 User Manual

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8-1. Specifications

Fuel information

You must only use unleaded gasoline in your vehicle.
Select premium unleaded gasoline with an octane rating of 91 (Research
Octane Number 96) or higher required for optimum engine performance. If
91 octane cannot be obtained, you may use unleaded gasoline with an octane
rating as low as 87 (Research Octane Number 91). Use of unleaded gasoline
with an octane rating lower than 91 may result in engine knocking. Persistent
knocking can lead to engine damage and should be corrected by refueling
with higher octane unleaded gasoline.
At minimum, the gasoline you use should meet the specifications of ASTM
D4814 in the U.S.A..

Fuel tank opening for unleaded gasoline

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To help prevent incorrect fueling, your Lexus has a fuel tank opening that only accommo-
dates the special nozzle on unleaded fuel pumps.

Gasoline quality

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In very few cases, driveability problems may be caused by the brand of gasoline you are
using. If driveability problems persist, try changing the brand of gasoline. If this does not
correct the problem, consult your Lexus dealer.
Gasoline quality standards
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Automotive manufacturers in the U.S.A., Europe and Japan have developed a specifi-
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cation for fuel quality called the World-Wide Fuel Charter (WWFC), which is expected
to be applied worldwide.
The WWFC consists of four categories that are based on required emission levels. In
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the U.S., category 4 has been adopted.
The WWFC improves air quality by lowering emissions in vehicle fleets, and improves
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customer satisfaction through better performance.
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