Used BMW 8 Series Water Pump

Yes, all variants of the BMW 8 Series (G15 coupe, G14 convertible, G16 Gran Coupe) are fitted with a water pump as part of the engine cooling system, covering petrol and diesel engines across the range. Electric water pumps are used on many of these engines, so the pump is engine-code specific rather than a simple mechanical unit. Make sure you know your engine code before sourcing one.

Both the 2019 and 2022 840i sit within the same G15/G14/G16 generation, which ran from 2018 onwards, and both use the B58 petrol engine, so on paper the engine match looks promising. However, ancillary and mounting changes can occur mid-production without a formal facelift, so you should confirm compatibility with the breaker against your exact registration rather than assume a straight swap.

Engine code matters above everything else for a water pump on the 8 Series — a 2020 840d with the B57 diesel uses a completely different pump to a 2020 840i with the B58 petrol or an M850i with the S58 or N63 unit. Searching by year alone will produce misleading results because multiple engines were available across the same model year. Check your V5 or run a VIN check to get your exact engine code before approaching a breaker.

Yes — the M850i xDrive uses a different engine (the N63 V8 in early cars) compared to the straight-six B58 in the 840i or the B57 diesel in the 840d, so the water pumps are not interchangeable between these variants. Trim level alone does not affect fitment, but in this case the trim name directly indicates a different drivetrain, which is what drives the part difference. Always quote your engine code to the breaker to ensure you get the correct unit.

Body style — whether G15 coupe, G14 convertible, or G16 Gran Coupe — does not affect water pump fitment; what matters is your engine code, fuel type, and model year. A B58-engined 840i Gran Coupe and a B58-engined 840i Coupe of the same year should use the same pump. Give the breaker your engine code and registration rather than your body style.

The 8 Series generation (G15/G14/G16) launched in 2018 and a 2021 car is from the same generation, so if the engine codes match there is a reasonable basis for compatibility. That said, ancillary or mounting detail changes can occur within a generation's production run, so confirm fitment with the breaker against both registrations before purchasing — never assume a same-engine code guarantees an exact swap across a several-year gap.