Used BMW 8 Series Starter Motor

The BMW 8 Series in its current generation (G14/G15/G16, from 2018 onwards) uses a starter motor matched to the engine code rather than the model year, so within the same engine code a unit from an earlier car will often correspond to a later one — but BMW did make running production changes to ancillary and mounting arrangements during the generation's life, so always confirm compatibility with the breaker against your exact registration before buying.

No — the 840i is a petrol engine (typically the B58 straight-six) and the 840d is a diesel (typically the B57 straight-six), and these use completely different starter motors sized and configured for their respective engines; you must match the part to the correct fuel type and engine code, not just the badge.

No, trim level makes no difference to the starter motor — M Sport, Pro, and standard trims all share the same drivetrain hardware when the engine code is the same, so the M Sport badge, body styling, or interior specification will not change which unit you need.

Yes — the M850i uses the N63 or S63 twin-turbocharged V8, while the 840i uses a B58 straight-six, so the starter motors are not interchangeable; always quote your engine code (visible on your V5 or via a VIN check) to the breaker to make sure you get the right unit.

Body style does not affect the starter motor at all — what matters is that the engine code matches, so a unit from a G16 Gran Coupé with the same engine code as a G15 Coupé is potentially the same part; confirm this against your registration with the breaker, as mounting or ancillary details can vary through production even within the same engine family.

Gearbox type can influence the starter motor's mounting position or ring-gear tooth count depending on whether the car uses an automatic or, if applicable, a different transmission variant, so it is worth telling the breaker both your engine code and gearbox type to avoid buying a unit that does not mount or mesh correctly.