BMW M3 S55 Engine Failed So Badly It Destroyed Its Own Cylinder Head

The BMW S55 Usually Has a Pretty Good ReputationThe BMW S55 engine has earned its fans, and it’s easy to see why. This twin-turbo 3.0-liter inline-six, found in the F80 M3 and F82 M4, is often called one of BMW M’s more reliable modern engines – if you keep up with maintenance. Out of the box, it puts down 425 horsepower and 406 lb-ft of torque. Even better, it can take a fair bit of tuning abuse before your wallet starts sweating.That said, the S55 is a tuner’s dream. Bolt-ons, bigger turbos, ethanol mixes, wild ECU tunes – these cars see it all, and many keep running strong for years.But even the S55 has its limits, especially if you ignore maintenance …