Lexus GS350 Owner's Manual page 387

NOTICE
To prevent serious engine damage
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Check the oil level on a 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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GS350_300_GS F_OM_OM30G34U_(U)
6-3. Do-it-yourself maintenance
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