Lexus CT200h Owner's Manual page 522

4-3. 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.
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 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/power control unit coolant reservoir
caps, 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.
CAUTION
When the hybrid system is hot
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Do not remove the engine/power control unit coolant reservoir caps.
The cooling system may be under pressure and may spray hot coolant if the cap is
removed, causing serious injuries, such as burns.
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CT200h_U (OM76040U)