Lexus 2007 GS430 Quick Manual page 457

Engine coolant
The coolant level is satisfactory if it is between the "FULL" and "LOW"
lines on the reservoir when the engine is cold.
If the coolant level drops within a short time after replenishing
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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.
Coolant selection
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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.
4-3. Do-it-yourself maintenance
Reservoir cap
FULL
LOW
If the level is on or below the
"LOW" line, add coolant up to the
"FULL" line.
I n f o r ma t i o n P r o v i d e d b y :
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