Toyota Prius 2011 Manual page 440

4-3. Do-it-yourself maintenance
Engine oil consumption
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The amount of engine oil consumed depends on the oil viscosity, the
quality of the oil and the way the vehicle is driven.
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More oil is consumed under driving conditions such as high speeds, fre-
quent acceleration and deceleration.
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A new engine consumes more oil.
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When judging the amount of oil consumption, keep in mind that the oil
may have become diluted, making it difficult to judge the true level accu-
rately.
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Oil consumption: Max. 1.1 qt./600 miles (1.0 L per 1000 km, 0.9 Imp. qt./
600 miles).
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If the vehicle consumes more than 1.1 qt. (1.0 L, 0.9 Imp.qt.) every
600 miles (1000 km), contact your Toyota dealer.
After changing the engine oil (U.S.A. only)
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The oil change system should be reset. Perform the following steps:
STEP 1
Turn the "POWER" switch OFF with the trip meter A shown.
Turn the "POWER" switch ON with the MPH or km/h button 
STEP 2
(P. 185) held down.
STEP 3
Keep pressing the button until the trip meter indicates "000000" and
the multi-information display indicates that the reset is complete.
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