Lexus RC350 Owner's Manual page 510

510
7-3. Do-it-yourself maintenance
Intercooler coolant reservoir (RC200t only)
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The coolant level is satisfactory if it is between the "F" and "L" lines on the res-
ervoir when the engine is cold.
Reservoir cap
1
"F" line
2
"L" line
3
If the level is on or below the "L" line,
add coolant up to the "F" line.
(→P. 630)
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 engine 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 and intercooler 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.