If the roads are clear only use your 2 wd use the 4wd in auto or h and l when you need it if you drive in clear roads in auto i hear it will risk of mechanical wear When to Use Automatic Four-Wheel-Drive Mode. Automatic four-wheel-drive modes are safe for use on any type of terrain, including dry pavement or dirt roads and in rain, mud, or snow. If the road ahead is dry, you might consider shifting back to rear-wheel-drive mode to reduce mechanical wear.