Can part-time 4WD be used for a long time in snowy days?
3 Answers
Part-time 4WD cannot be used for a long time in snowy days because part-time 4WD cannot turn. The front wheels steer like in a front-wheel-drive vehicle, while the rear wheels are also rotating, with a transfer case added below. Part-time 4WD is a manually switched driving mode by the driver, who can choose between two-wheel drive or four-wheel drive mode by engaging or disengaging the transfer case. Part-time 4WD is a common driving mode in SUV models, with the advantage of ensuring both the vehicle's power and off-road capability while also considering fuel economy. The slight drawback is that the driver needs to judge the road conditions and manually operate the driving mode.
Using part-time four-wheel drive in snowy conditions can indeed improve traction, but it shouldn't be engaged for extended periods unless the road is completely snow-covered. This system is designed for temporary use, such as when encountering slippery surfaces or climbing hills, where it redistributes power. However, once the road becomes dry or partially thawed, differences in tire rotation can stress the driveshaft and transfer case, potentially leading to wear or failure. I once kept it engaged during a long-distance drive in a snowstorm, and the car developed strange noises—later inspection revealed the transfer case needed repairs. Remember to switch back to two-wheel drive immediately after the snow melts to avoid issues. Additionally, pairing it with snow tires makes the car more stable and gives you more confidence when driving in snow. In short, use part-time four-wheel drive flexibly, adjusting it according to road conditions in real time.
Last winter during heavy snowfall, I used part-time four-wheel drive to get unstuck in the mountains, which worked quite well, but I know it shouldn't be left on continuously. That time I drove on a snow-covered path with 4WD engaged, then forgot to turn it off when I reached dry pavement and drove for over two hours – the car vibrated noticeably more and consumed extra fuel. The mechanic told me this accelerated wear on drivetrain components, so now I only engage 4WD in deep snow or sharp turns, switching back immediately when I see bare asphalt. This approach also helps reduce fuel consumption and maintenance costs; I normally use two-wheel drive with snow chains for smoother operation. Safe winter driving is crucial, and promptly adjusting drive modes can minimize skidding accidents.
