2005 Lexus GS 300 Owners Manual - Page 288

ENGINE - COOLING SYSTEM Capacity Coolant type 9.0 L (9.5 qt., 7.9 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. - 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 SK20R11 IFR6A11 1.1 mm (0.043 in.) - Charging rates 262