2010 Lexus IS 250 Owners Manual - Page 626

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6-1. Specifications

6

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Gasoline quality

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.

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Gasoline quality standards

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Automotive manufacturers in the US, Europe and Japan have developed a

specification for fuel quality called World-Wide Fuel Charter (WWFC) that is

expected to be applied worldwide.

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The WWFC consists of four categories that are based on required emission

levels. In the US, category 4 has been adopted.

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The WWFC improves air quality by lowering emissions in vehicle fleets, and

customer satisfaction through better performance.

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Lexus recommends the use of gasoline containing detergent additives

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Lexus recommends the use of gasoline that contains detergent additives to

avoid build-up of engine deposits.

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All gasoline sold in the US contains detergent additives to clean and/or keep

clean intake systems.

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Lexus recommends the use of cleaner burning gasoline

Cleaner burning gasoline, including reformulated gasoline that contains oxygen-

ates 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 perfor-

mance, reduce vehicle emissions and improve air quality.

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Lexus does not recommend blended gasoline

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Lexus allows the use of oxygenate blended gasoline where the oxygenate con-

tent is up to 10% ethanol or 15% MTBE.

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If you use gasohol in your Lexus, 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.