Toyota 2013 Prius Owner's Manual page 484

4-3. Do-it-yourself maintenance
Engine oil
With the engine at operating temperature and turned off, check the oil
level on the dipstick.
Checking the engine oil
■
Park the vehicle on level ground. After warming up the engine
STEP 1
and turning off the hybrid system, wait more than 5 minutes
for the oil to drain back into the bottom of the engine.
STEP 2
Wipe the dipstick clean.
STEP 3
STEP 4 Flat dipstick: Reinsert the dipstick fully.
STEP 4
Holding a rag under the end, pull the dipstick out and check
STEP 5
the oil level.
Wipe the dipstick and reinsert it fully.
STEP 6
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PRIUS PHV_OM_OM47787U_(U)
Holding a rag under the end, pull
the dipstick out.
Non-flat dipstick: Reinsert the
dipstick fully with its protruding
areas ( in the illustration)
pointing towards the engine.