Lexus 2015 RX350 Owner's Manual page 801

NOTICE
When adding engine coolant
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Wait until the engine has cooled down before adding engine coolant.
When adding coolant, do so slowly. Adding cool coolant to a hot engine too quickly
can cause damage to the engine.
To prevent damage to the cooling system
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Observe the following precautions:
Avoid contaminating the coolant with foreign matter (such as sand or dust etc.).
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Do not use any coolant additives.
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5-2. Steps to take in an emergency
I n f o r ma t i o n P r o v i d e d b y :
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