Lexus IS250 U Owner's Manual page 523

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.
Recommendation of the use of cleaner burning gasoline
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Cleaner burning gasoline, including reformulated gasoline that contains oxygenates
such as ethanol or MTBE (Methyl Tertiary Butyl Ether) is available in many areas.
Lexus recommends the use of cleaner burning gasoline and appropriately blended
reformulated gasoline. These types of gasoline provide excellent vehicle performance,
reduce vehicle emissions and improve air quality.
Non-recommendation of the use of blended gasoline
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Use only gasoline containing up to 15% etha-
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nol.
DO NOT use any flex-fuel or gasoline that
could contain more than 15% ethanol, includ-
ing from any pump labeled E30, E50, E85
(which are only some examples of fuel con-
taining more than 15% ethanol).
If you use gasohol in your vehicle, be sure that it has an octane rating no lower than 87.
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Lexus does not recommend the use of gasoline containing methanol.
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Non-recommendation of the use of gasoline containing MMT
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Some gasoline contains an octane enhancing additive called MMT (Methylcyclopenta-
dienyl Manganese Tricarbonyl).
Lexus does not recommend the use of gasoline that contains MMT. If fuel containing
MMT is used, your emission control system may be adversely affected.
The malfunction indicator lamp on the instrument cluster may come on. If this happens,
contact your Lexus dealer for service.
If your engine knocks
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Consult your Lexus dealer.
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You may occasionally notice light knocking for a short time while accelerating or driv-
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ing uphill. This is normal and there is no need for concern.
IS350/250_U (OM53C50U)
9-1. Specifications
DO NOT use gasoline con-
taining more than 15% ethanol.
(30% ethanol)
(50% ethanol)
(85% ethanol)
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