In which situation would a part-time 4WD system not be recommended?

A part-time 4WD system is designed for use in specific conditions where extra traction is needed, such as off-road driving or on slippery surfaces like snow or mud. This system engages the front wheels when additional traction is necessary but is not intended for continuous use on dry pavement, as it can lead to drivetrain binding.

When using a part-time 4WD system on dry pavement, the wheels can experience different levels of traction, especially during turns, due to the rigid connection between the front and rear axles. This causes stress on the drivetrain and could lead to increased wear or damage. Thus, using this system on dry pavement is generally not recommended because it does not provide the intended benefits and can result in undesirable vehicle handling and potential mechanical issues.

In contrast, conditions such as snow-covered roads and heavy rain, or off-road situations, typically benefit from the increased traction provided by a part-time 4WD system, making it ideal for those scenarios.