2010 Toyota Land Cruiser Owners Manual - Page 459
2010 Toyota Land Cruiser Manual
Page 459 highlights
4-3. Do-it-yourself maintenance Engine coolant The coolant level is satisfactory if it is between the "F" and "L" lines on the reservoir when the engine is cold. Reservoir cap "F" "L" If the level is on or below the "L" line, add coolant up to the "F" line.