2000 Lexus GS 300 Owners Manual - Page 414

ENGINE - IGNITION SYSTEM Spark plug - Make - Gap - ELECTRICAL SYSTEM Battery - Open voltage at 20_C (68_F): 12.7V Fully charged 12.3V Half charged 11.9V Discharged [Voltage that is checked 20 minutes after the key is removed with all the lights turned off] 5A max. DENSO NGK PK16TR11 BKR5EKPB11 1.1 mm (0.043 in.) Charging rates FUEL Fuel type Your vehicle must use only unleaded gasoline. To help prevent gas station mixups, your Lexus has a smaller fuel tank opening. The special nozzle on pumps with unleaded fuel will fit it, but the larger standard nozzle on pumps with leaded gas will not. At a minimum, the gasoline you use should meet the specifications of ASTM D4814 in the U.S.A. and CGSB 3.5-M93 in Canada. Do not use leaded gasoline. Use of leaded gasoline will cause the three-way catalytic converter to lose its effectiveness and the emission control system to function improperly. Also, this can increase maintenance costs. Octane rating Select premium unleaded gasoline with an Octane Rating of 91 (Research Octane Number 96) or higher for optimum engine performance. However, if such premium type cannot be obtained, you may temporarily use unleaded gasoline with an Octane Rating as low as 87 (Research Octane Number 91). NOTICE 394