2006 Lexus RX 400h Owners Manual - Page 573

HYBRID SYSTEM - COOLING SYSTEM Capacity Engine coolant Inverter coolant Coolant type 10.3 L (10.9 qt., 9.0 Imp. qt.) 3.4 L (3.6 qt., 3.0 Imp. 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.) Please contact your Lexus dealer for further details. - IGNITION SYSTEM Spark plug - Make - Gap DENSO NGK SK20R11 IFR6A11 1.1 mm (0.043 in.) 537