2007 Lexus RX 350 Owners Manual - Page 316

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. Reservoir cap Full Low 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, drain cock and water pump. If you cannot find a leak, have your Lexus dealer pressure test the cap and check for leaks in the cooling system. n Coolant selection 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. U.S.A.: Toyota Super Long Life Coolant is a mixture of 50% coolant and 50% deionized water. (Enabled: -31°F [-35°C]) Canada: Toyota Super Long Life Coolant is a mixture of 55% coolant and 45% deionized water. (Enabled: -44°F [-42°C]) For more details about engine coolant, contact your Lexus dealer. CAUTION n When the engine is hot Do not remove the radiator cap. The cooling system may be under pressure and may spray hot coolant if the cap is removed, causing burns or other injuries. 296