Lexus 2004 GX470, Owner'S Manual

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STARTING AND DRIVING
368
NOTICE
A large amount of unburned gases flowing into the
three-way catalytic converter may cause it to overheat
and create a fire hazard. To prevent this and other
damage, observe the following precautions:
Use only unleaded gasoline.
Do not drive with an extremely low fuel level; running
out of fuel could cause the engine to misfire, creating
an excessive load on the three-way catalytic
converter.
Do not allow the engine to run at idle speed for more
than 20 minutes.
Avoid racing the engine.
Do not push-start or pull-start your vehicle.
Do not turn off the ignition while the vehicle is
moving.
Keep your engine in good running order.
Malfunctions in the engine electrical system, electric
ignition system or fuel system could cause an
extremely high three-way catalytic converter
temperature.
If the engine becomes difficult to start or stalls
frequently, take your vehicle in for a check-up as
soon as possible. Remember, your Lexus dealer
knows your vehicle and its three-way catalytic
converter system best.