2006 Lexus LS 430 Owners Manual - Page 383

6-1. Specifications Fuel information Your vehicle must use only unleaded gasoline. Select premium unleaded gasoline with an Octane Rating of 91 (Research Octane Number 96) or higher for optimum engine performance. At minimum, the gasoline you use should meet the specifications of ASTM D4814 in the USA and CGSB 3.5-M93 in Canada. n Fuel tank opening for unleaded gasoline l To help prevent incorrect fueling, your Lexus has a fuel tank opening that will only accept the special nozzle on unleaded fuel pumps. l If premium fuel is not available, you may temporarily use unleaded gasoline with an Octane Rating as low as 87 (Research Octane Number 91). n If your engine knocks ...l Consult your Lexus dealer. l You may occasionally notice light knocking for a short time while accelerating or driving up hills. This is normal and there is no need for concern. n 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. n Gasoline quality standards l Automotive manufacturers in the US, Europe and Japan have developed a 6 specification for fuel quality called World-Wide Fuel Charter (WWFC) that is expected to be applied worldwide. l The WWFC consists of four categories that are based on required emission Vehicle specifications levels. In the US, category 3 has been adopted. l The WWFC improves air quality by lowering emissions in vehicle fleets, and customer satisfaction through better vehicle performance. 373