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SW-User
You wont need the lower ones for a normal drive. Only needed for steep hills when you want some power without the gear shifting and steep downhill when you want to control the gear shifts. Some other uses may be for tow.
D4 will automatically shift the gears from 1 to 4 for all normal driving conditions.
D4 will automatically shift the gears from 1 to 4 for all normal driving conditions.