Part-time AWD: These systems are typically 100% front-wheel drive based, transferring power to the rear wheels only after slippage to the front wheels occurs. They require no driver intervention ...

For those unfamiliar with how AWD systems work, the gist is that all four wheels are provided differing power levels at any given time, responding to road conditions to prevent slippage.

Every major automaker acknowledges this and provides some form of AWD. Mercedes-Benz has a 4MATIC system, Audi features the ...