Lexus IS220d 2012 Manual page 434

Engine coolant
The coolant level is satisfactory if it is between the "FULL" and
"LOW" lines on the reservoir when the engine is cold.
IS250
IS220d and IS200d
IS250/220d/200d_EE
4-3. Do-it-yourself maintenance
Reservoir cap
"FULL"
"LOW"
If the level is on or below the
"LOW" line, add coolant up to
the "FULL" line.
Reservoir cap
"FULL"
"LOW"
If the level is on or below the
"LOW" line, add coolant up to
the "FULL" line.
4
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