All wheel drive, or AWD, is always on. All 4 wheels get turned by the engine. However, this causes a lot of unnecessary, and damaging, wear and tear on regular drive trains (the stuff that connects the engine to the wheels). So they are designed to be “loosey goosey” so they don’t get damaged from moving at high speeds. But this means less power is actually applied to all the wheels.
4WD is only meant to be trained on when 2 wheels is simply not enough to get you moving. Usually used when in snow, mud, loose dirt, etc., And usually because you are stuck, or afraid or being stuck, and not moving fast. However, this causes excess strain on the drivetrain when moving at high speeds, and especially when turning. So you really shouldn’t have it on when you don’t need it.
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