Lexus RX450H Manual page 517

4-3. Do-it-yourself maintenance
NOTICE

To prevent serious engine damage
Check the oil level on a regular basis.

When replacing the engine oil

Be careful not to spill engine oil on the vehicle components.

Avoid overfilling, or the engine could be damaged.

Check the oil level on the dipstick every time you refill the vehicle.

Be sure the engine oil filler cap is properly tightened.
Coolant
The coolant level is satisfactory if it is between the "FULL" and
"LOW" lines on the reservoir when the engine and hybrid system
are cold.
Engine coolant reservoir
484
RX450h_EE
Reservoir cap
"FULL" line
"LOW" line
If the level is on or below the
"LOW" line, add coolant up to
the "FULL" line. (P. 615)