Lexus IS 350 2019 Owner's Manual page 550

548
7-3. Do-it-yourself maintenance
Coolant selection
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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.
"Toyota Super Long Life Coolant" is a mixture of 50% coolant and 50% deionized water.
(Minimum temperature: -35C [-31F])
For more details about coolant, contact your Lexus dealer.
If the coolant level drops within a short time of replenishing
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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.
WARNING
When the engine is hot
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Do not remove the engine coolant reservoir cap, intercooler coolant reservoir cap
(IS300), or coolant inlet cap. (P. 655)
The cooling system may be under pressure and may spray hot coolant if the cap is
removed, causing serious injuries, such as burns.
NOTICE
When adding coolant
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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 cool-
ing. Be sure to read the antifreeze or coolant label.
If you spill coolant
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Be sure to wash it off with water to prevent it from damaging parts or paint.
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