Toyota 2008 Prius Quick Reference Manual page 394

Adding engine oil
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If the oil level is below or near the low level mark, add engine oil of
the same type as already in the engine.
Oil grade
Oil quantity
(Low → Full)
Items
STEP 1
Remove the oil filler cap.
STEP 2
Add engine oil slowly, checking the dipstick.
STEP 3
Install the filler cap, turning it clockwise until you hear a click.
PRIUS_U_(L/O_0802)
Make sure to check the oil type
and prepare the items needed
before adding oil.
ILSAC multigrade engine oil
1.6 qt. (1.5 L, 1.3 Imp. qt.)
Clean funnel
4-3. Do-it-yourself maintenance
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