See also:

Ruts and gravel roads
Observe the following rules when driving along ruts in off-road terrain or on roads with loose gravel: Check that the ruts are not too deep and that your vehicle has sufficient clearance. O ...

Treadwear indicators
Narrow bars (tread wear bars) that are distributed over the tire tread. If the tire tread is level with the bars, the wear limit of 1/16 in (1.6 mm) has been reached. ...

Checklist before driving off-road
► Engine oil level: check the engine oil and top it up if necessary. The vehicle can only guarantee a smooth supply of oil on steep stretches if there is a sufficient level of engine oil ...