â Engine oil selection
âToyota Genuine Motor Oilâ is used in your Toyota vehicle. Use
Toyota approved âToyota Genuine Motor Oilâ or equivalent to satisfy
the following grade and viscosity.
Oil grade: ILSAC GF-5 multigrade engine oil
Recommended viscosity: SAE 0W-20
SAE 0W-20 is the best choice
for good fuel economy and
good starting in cold weather.
If SAE 0W-20 is not available,
SAE 5W-20 oil may be used.
However, it must be replaced
with SAE 0W-20 at the next oil
change.
Source : 2015 Prius C Owners Manual Through April 2015 Prod. (OM52E68U) - Page 493.