Lexus GS300 1998 Owner's Manual page 283

STARTING AND DRIVING
To use the braking power of the engine, downshift the
transmission in the way described below:
1
Shift into the "4" position. The transmission will
downshift to the fourth gear and engine braking will be
obtained.
When the cruise control is being used, even if you
downshift from "D" to "4", engine braking will not be
applied because the cruise control is not cancelled. If
you need to decrease the vehicle speed, see page 283.
2 Shift into the "3" position. The transmission will
downshift to the third gear when the vehicle speed is or
becomes lower than the speed listed below and more
powerful engine braking will be obtained.
270
3 Shift into the "2" position. The transmission will
downshift to the second gear when the vehicle speed is
or becomes lower than the speed listed below and more
powerful engine braking than that of "3" position will
be obtained.
4 Shift into the "L" position. The transmission will
downshift to the first gear when the vehicle speed is or
becomes lower than the speed listed below and
maximum engine braking will be applied.
GS400
km/h (mph)
(mph)
"3" 147 (91)
)
"2" 99 (62)
)
"L" 17 (11)
)
GS300
k m / h
125 (78
84 (52
16 (10