4x4 Auto is like 4x4 Part-time. The vehicle constantly senses whether or not wheels are slipping and engages 4WD as necessary. The 4WD auto system should turn off after the car is shut off and thus you'd need to turn it on any time you wanted to use it.
Besides, is a 4x4 the same as 4 wheel drive?
So while 4WD and 4x4 are the same, AWD is different. 4WD and 4x4 are basically the same thing - one stands for Four Wheel Drive, the other is Four By Four. All-wheel drive vehicles will usually have three differentials - front, rear and centre to distribute torque between the axles.
Can you switch to four wheel drive while driving?
Older 4WD systems must be manually shifted between 2WD and 4WD and from 4HI to 4LO while the vehicle is stopped. Newer systems have electronic push button 'on the fly' features that let you shift while driving. An AWD car can deliver all engine torque to all four wheels all the time.
Is a 4x4 the same as all wheel drive?
Both cars drive all four wheels so in one sense there is no difference except that AWD has become an accepted description for a car that drives all of the wheels, all of the time. 4WD is normally used on large SUV Four-Wheel Drive (4x4) vehicles designed to use the extra traction of 4WD in off road situations.