IS350 AWD/IS350/IS300- Page 293

293

6-3. Do-it-yourself maintenance

6

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between the “F” and “L” lines on the 
reservoir when the engine is cold.

Reservoir cap
“F” line
“L” line

If the level is on or below the “L” line, add 
coolant up to the “F” line. (



P.357)

■

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 mix-

ture of 50% coolant and 50% deionized 

water. (Minimum temperature: -31°F 

[-35°C])
Canada:
“Toyota Super Long Life Coolant” is a mix-

ture of 55% coolant and 45% deionized 

water. (Minimum temperature: -44°F 

[-42°C])
For more details about engine coolant, con-

tact 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.

Check the radiator, condenser and 
intercooler radiator (if equipped) and 
clear away any foreign objects.
If any of the above parts are extremely 
dirty or you are not sure of their condi-
tion, have your vehicle inspected by 
your Lexus dealer.

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B

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WARNING

■

When the engine is hot

Do not remove the engine coolant reser-

voir cap, intercooler coolant reservoir 

cap (IS300), or coolant inlet cap. 

(



P.360)

The cooling system may be under pres-

sure and may spray hot coolant if the cap 

is removed, causing serious injuries, such 

as burns.

NOTICE

■

When adding coolant

Coolant is neither plain water nor 

straight antifreeze. The correct mixture 

of water and antifreeze must be used to 

provide proper lubrication, corrosion 

protection and cooling. Be sure to read 

the antifreeze or coolant label.

■

If you spill coolant

Be sure to wash it off with water to pre-

vent it from damaging parts or paint.

Checking the radiator, con-
denser and intercooler radiator 
(if equipped)

WARNING

■

When the engine is hot

Do not touch the radiator, condenser or 

intercooler radiator (if equipped) as they 

may be hot and cause serious injuries, 

such as burns.