2005 Lexus IS 300 Owners Manual - Page 349

04 06.30 ENGINE - COOLING SYSTEM Capacity Coolant type 7.5 L (7.9 qt., 6.6 lmp.qt.) "Toyota Super Long Life Coolant" or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology. (Coolant with long-life hybrid organic acid technology is a combination of low phosphates and organic acids.) Do not use plain water alone. NOTE: "Toyota Super Long Life Coolant" is used in your Lexus vehicle at factory fill. In order to avoid technical problems, only use "Toyota Super Long Life Coolant" or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology. (Coolant with long-life hybrid organic acid technology is a combination of low phosphates and organic acids.) Do not use plain water alone. Please contact your Lexus dealer for further details. - FUEL Fuel type Octane rating - IGNITION SYSTEM Spark plug - Make - Gap Unleaded gasoline only 91 (Research octane number 96) or higher DENSO SK16R-P11 1.1 mm (0.043 in.) - ELECTRICAL SYSTEM Battery - Open voltage at 20_C (68_F): Charging rates 328 12.7 V Fully charged 12.3 V Half charged 11.9 V Discharged [Voltage that is checked 20 minutes after the key is removed with all the lights turned off] 5A max.