Altima 2.5 SL L4-2.5L (QR25DE) (2002)
Engine Oil: Testing and Inspection
OIL LEVEL AND MUDDINESS
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Before starting the engine, check the oil level. If the engine is already started, stop it and allow 10 minutes before checking.
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Check that the oil level is within the range on the dipstick.
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If it is out of range, add oil as necessary.
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Check the oil for white turbidity or heavy contamination.
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If the oil becomes turbid and white, it is highly probable that it is contaminated with coolant. Determine the cause and correct as necessary.