The drivetrain pairs the 4.0 TT V8 with a 48-volt mild-hybrid system that stores braking energy, powers the electrical system in place of an alternator, and enables cylinder deactivation. The cars are young, but some owners report ancillary replacements (fuel pump, alternator, water pump) even at low mileage — worth checking service history for.
Mild-hybrid 4.0 TT — and some early wear items
Audi RS7 (C8) · mechanical