Lexus IS250 U Owner's Manual page 417

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
1
"FULL" line
2
"LOW" line
3
If the level is on or below the "LOW"
line, add coolant up to the "FULL" line.
(P. 506)
Coolant selection
■
Only use "Toyota Super Long Life Coolant" or a 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.
(Minimum temperature: -31F [-35C])
Canada:
"Toyota Super Long Life Coolant" is a mixture of 55% coolant and 45% deionized water.
(Minimum temperature: -44F [-42C])
For more details about engine coolant, contact your Lexus dealer.
If the coolant level drops within a short time of replenishing
■
Visually check the radiator, hoses, engine coolant reservoir cap, drain cock and water
pump.
If you cannot find a leak, have your Lexus dealer test the cap and check for leaks in the
cooling system.
IS350/250_U (OM53C50U)
7-3. Do-it-yourself maintenance
417
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