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Four wheel drive often only provides power to two wheels, one front and one rear. All wheel drive provides power to all four wheels.
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As it turns out, "all-wheel drive" refers to vehicles that have permanently engaged or automatically engaging four-wheel-drive capability. "Four-wheel drive" implies the vehicle has manually engaging, temporary four-wheel drive. Your confusion is justified -- the auto industry, in their infinite wisdom, created these seemingly interchangeable terms. What is four-wheel drive, exactly? According to a helpful 4X4 glossary* , a four-wheel-drive vehicle has the ability to send power to all four wheels (not just the front two), giving the car more traction and stability. This helps when driving off road or on rough terrain. Some current all-wheel-drive vehicles on the market are the Oldsmobile Bravada, the Toyota RAV-4, and the Mercury Mountaineer
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