Fuel Information - Lexus GS450h2016 Service Manual

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8-1. Specifications

Fuel information

You must only use unleaded gasoline.
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
and significantly reduced performance. 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..
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.
Recommendation of the use of gasoline containing detergent additives
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Lexus recommends the use of gasoline that contains detergent additives to avoid the
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build-up of engine deposits.
All gasoline sold in the U.S.A. contains minimum detergent additives to clean and/or
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keep clean intake systems, per EPA' s lowest additives concentration program.
Lexus strongly recommends the use of Top Tier Detergent Gasoline. For more informa-
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tion on Top Tier Detergent Gasoline and a list of marketers, please go to the official
website www.toptiergas.com.
GS450h_OM_OM30E99U_(U)