Lexus RX450H Manual page 672

6-1. Specifications
Lubrication system
Oil capacity
(Drain and refill
 reference*)
With filter
Without filter
*:The engine oil capacity is a reference quantity to be used when
changing the engine oil. Warm up the engine and turn off the hybrid
system, wait more than 5 minutes, and check the oil level on the
dipstick.

Engine oil selection
"Toyota Genuine Motor Oil" is used in your Lexus vehicle. Lexus
recommends the use of approved "Toyota Genuine Motor Oil".
Another motor oil of matching quality can also be used.
Oil grade:
0W-20, 5W-20, 5W-30 and 10W-30:
API grade SL "Energy-Conserving", SM "Energy-Conserving" or
SN "Resource-Conserving"; or ILSAC multigrade engine oil
15W-40 and 20W-50:
API grade SL, SM or SN multigrade engine oil
628
RX450h_EE
6.1 L (6.4 qt., 5.4 Imp. qt.)
5.7 L (6.0 qt., 5.0 Imp. qt.)