The naturally aspirated M113 V8 and its automatic are the car's headline strength; owners repeatedly call the drivetrain bulletproof and report six-figure mileages with no major failures. High-mileage cars (200k+, one anecdote of 400k) still command money, and the NA engine is praised as cheaper and simpler to repair than the later supercharged AMG motors.
M113 5.4L V8 and drivetrain reliability
Mercedes-Benz E55 AMG (W210) · mechanical