2006 Lexus LS 430 Owners Manual - Page 280

4-3. Do-it-yourself maintenance Engine coolant The coolant level is satisfactory if it is between the "FULL" and "LOW" lines on the reservoir when the engine is cold. 1 2 3 Reservoir cap Full line Low line If the level is on or below the "LOW" line, add coolant up to the "Full" line. n If the coolant level drops within a short time after replenishing Visually check the radiator, hoses, engine coolant filler cap, radiator cap and drain cock and water pump. If you cannot find a leak, have your Lexus dealer test the cap pressure and check for leaks in the cooling system. n Coolant type selection Use of improper coolants may damage your engine cooling system. 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.) For the USA : "Toyota Super Long Life Coolant" is a mixture of 50% coolant and 50% distilled or deionized water. (Protects to: -35°C (-31°F)) For Canada : "Toyota Super Long Life Coolant" is a mixture of 55% coolant and 45% distilled or deionized water. (Protects to: -42°C (-44°F)) Please contact your Lexus dealer for further details. 268