The BMW M3 petrol automatic is a high-output M car (recent generations use a 3.0-litre twin-turbo straight-six) paired with BMW’s M automatic/Steptronic transmission and often offered with either rear-wheel drive or xDrive AWD on higher-performance trims. Expect manufacturer-specific components (M differential, optional carbon-ceramic brakes, performance suspension) and premium petrol requirement; these raise routine service costs and replacement-part prices. Check whether the car is an M Competition or has factory options (ceramic brakes, forged wheels, M Carbon) because those affect maintenance and insurance significantly.

• Confirm drivetrain: RWD or xDrive specification and that the active M differential / AWD system operates smoothly (engage at low speed test).
• Brake package: verify whether carbon-ceramic brakes are fitted (they’re expensive to replace) and inspect rotor condition and pad wear sensors.
• Tyre type and manufacture date — performance tyres age even with low miles; check for correct size, date code and even wear.
• Transmission: confirm gearbox software level and ask when/if gearbox fluid service is scheduled (automatic M gearboxes need correct fluid and occasional servicing).
• Optional extras and factory build sheet: ensure any expensive options (M Carbon, upgraded seats, adaptive suspension) are present as advertised and documented.