Lexus LS460 Owners Book page 652

4-3. Do-it-yourself maintenance
Engine coolant
The coolant level is satisfactory if it is between the "FULL" and "LOW"
lines on the reservoir when the engine is cold.
If the coolant level drops within a short time after replenishing
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Visually check the radiator, hoses, 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 systems.
650
Reservoir cap
"FULL"
"LOW"
If the level is on or below the
"LOW" line, add coolant up to the
"FULL" line. (P. 739)