Lexus 2008 IS250 Owner's Manual page 297

NOTICE
To prevent serious engine damage:
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Check the oil level on regular basis.
When replacing the engine oil
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Be careful not to spill engine oil on the vehicle components.
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Avoid overfilling, or the engine could be damaged.
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Check the oil level on the dipstick every time you refill the vehicle.
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Be sure the engine oil filler cap is properly tightened.
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Engine coolant
The coolant level is satisfactory if it is between the "FULL" and "LOW"
lines on the reservoir when the engine is cold.
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.
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