Ever wondered how a high-mileage BMW M4 engine holds up? We tear down a 130,000-mile S55 to inspect its condition and install the Evolve Billet Crank Hub Fix. Watch as we reveal the wear and tear ...

2017 BMW M4 DTM Champion Edition - 500 Horsepower (S55 Engine) The 2017 BMW M4 DTM Champion Edition carried the highest-powered version of the BMW S55 inline six engine produced for a street car.