There isn't really anything wrong with the 2019 BMW M135i. In fact, it gets a lot of things right. It's sturdy, functional, and speedy. It just lacks the intrigue and personality of some of its competitors, and it faces the additional problem of succeeding the rare rear-drive, straight-six powered "F20" M140i. It has always struggled to fill those shoes as an automobile with the much more common inline-four/four-wheel drive configuration.

In order to boost rigidity at the opposite end of the suspension, BMW altered the mounts for the trailing and control arms, and springs and dampers have been adjusted all around. The last chassis change has to do with tires. The optional 19-inch rims are fitted with somewhat larger PS4 S tires, while the 18-inch wheels come with Michelin Pilot Sport 4s as standard.

Traction control, torque steer correction, and the "xDrive" four-wheel drive systems have all undergone software modifications. According to the latter claim, the vehicle now drives all four wheels more often, however, as previously, it will never transfer more than 50% of its torque to the rear wheels.