Lexus 2012 RX450h Owner's Manual page 752

4-3. Do-it-yourself maintenance
■
Adding engine oil
RX350
RX450h
752
If the oil level is below or near the
low level mark, add engine oil of
the same type as that already in the
engine.
If the oil level is below or near the
low level mark, add engine oil of
the same type as that already in the
engine.