2003 Lexus IS 300 Owners Manual - Page 337

ENGINE We recommend to use 50% solution for your Lexus, to provide protection down to about -35_C (-31_F). When it is extremely cold, to provide protection down to about -50_C (-58_F), 60% solution is recommended. Do not use more than 70% solution for better coolant performance. CHECKING THE RADIATOR AND CONDENSER If either of the above parts are extremely dirty or you are not sure of their condition, take you vehicle to Lexus dealer. NOTICE Do not use alcohol type antifreeze or plain water alone. The engine cooling system is integral to maximizing performance of your Lexus vehicle. In line with this, it is strongly recommended that you use "Toyota Genuine Long Life Coolant" for protecting the system, as it is an ethylene-glycol based premium antifreeze coolant with excellent corrosion protection properties that has been specifically formulated for use in Lexus vehicles. Please contact your Lexus dealer for further details of the "Toyota Genuine Long Life Coolant" range. CAUTION To prevent yourself from burning, be careful not to touch the radiator or condenser when the engine is hot. NOTICE To prevent damage to the radiator and condenser, do not perform the work by yourself. 320 2003 IS300 from Aug. '02 Prod. (OM53439U)