Lexus IS250 2006 Owner's Manual page 290

4-3. Do-it-yourself maintenance
NOTICE
To prevent serious engine damage:
■
Check the oil level on regular basis.
When replacing the engine oil
■
Be careful not to spill engine oil on the vehicle components.
●
Avoid overfilling, or the engine could be damaged.
●
Check the oil level on the dipstick every time you refill the vehicle.
●
Be sure the engine oil filler cap is properly retightened.
●
Engine coolant
The coolant level is satisfactory if it is between the FULL and LOW lines
on the reservoir when the engine is cold.
272
Reservoir cap
Full
Low
If the level is on or below the LOW
line, add coolant up to the FULL
line.