BMW 8 Series Crankshaft Replacement Parts

Almost certainly not — the E31 8 Series used engines such as the M60, M62, and S62 V8s and the M70/M73 V12s, while the G15 generation uses entirely different engine families including the B57 diesel and B58/S58 petrol units, so the crankshafts are not interchangeable across these generations. Fitment of a crankshaft follows the engine code above everything else, so confirm the exact engine code from your V5 or a VIN check before approaching a breaker. Never assume a part crosses a generation boundary without the breaker verifying it against your registration.

Yes, fuel type matters significantly here: the 840d uses a six-cylinder diesel engine (B57 family) while the 840i uses a six-cylinder petrol engine (B58 family), and these are entirely different engines with different crankshafts that will not interchange. Always identify your engine code from the V5 or a VIN decoder rather than relying on the badge alone, as the badge only tells you the variant name. Supply your engine code to the breaker so they can match the correct crankshaft.

Trim level itself does not affect the crankshaft — what matters is the engine code, which is determined by the engine variant rather than the trim or equipment pack. An M Sport 840i and a standard 840i with the same engine code will use the same crankshaft, and cosmetic or suspension differences between trims are irrelevant to this mechanical component. The exception is the M8, which uses the S63 high-performance V8 and will need a crankshaft specific to that engine, not the standard 840i or 840d units.

Both sit within the G15 generation (2018–present) and share the B58 engine family, which makes a match much more plausible than crossing a generation boundary, but confirm the full engine code from both vehicles with the breaker before proceeding. Minor ancillary or specification changes can occur mid-production within a generation, so the breaker should verify compatibility against your exact registration rather than year alone. Never assume fitment is guaranteed without that check.

Yes, every variant of both the E31 8 Series (1989–1999) and the G15/G14/G16 8 Series (2018–present) is fitted with a combustion engine, and every combustion engine contains a crankshaft as a fundamental rotating component. This applies to all fuel types offered on the 8 Series — petrol and diesel — so there is no variant of this model that lacks one. What varies is the specific crankshaft design, which is determined entirely by the engine code.

Yes — the M8 uses the S63 twin-turbocharged V8 engine, which is a high-performance unit entirely separate from the B58 straight-six found in the 840i, so the crankshafts are completely different and not interchangeable. Used M8 crankshafts are likely to be rarer and potentially more expensive through a breaker given lower volumes of M8 cars being dismantled. Always provide your full engine code to the breaker to ensure they supply the correct unit for your specific car.