Making headway.

The variable M differential lock.

A little extra traction can make all the difference, and the torque-sensitive, variable M differential lock identifies exactly when traction is needed. Even when wheel grip varies enormously, roadholding remains excellent as the locking power between the left and right rear wheels can be raised to 100%. Sports car drivers know what this feature delivers: it optimises handling, improves safety and enhances the thrust provided by the M5's rear wheel drive.