BMW 8 Series Glow Plugs Replacement Parts

Only the diesel variants of the BMW 8 Series have glow plugs — petrol engines do not use them at all. The 8 Series range (G15 coupe, G14 convertible, G16 Gran Coupe, produced from 2018 onwards) was sold in the UK with diesel options such as the 840d, which uses a six-cylinder diesel engine and does have glow plugs. If your 8 Series is a petrol model — such as the 840i, M850i, or M8 — it will never have had glow plugs fitted, and what you may actually be looking for is an ignition coil or spark plug instead.

The G15 840d has been in production from 2018 and uses the B57 six-cylinder diesel engine throughout, so glow plugs from an earlier G15 840d are likely to be based on the same engine code. However, there can be ancillary and specification changes mid-production that are not always obvious, so confirm compatibility against your exact registration with the breaker before buying. The engine code from your V5 or a VIN check is the single most useful detail you can give them.

No — trim level makes no difference to glow plug fitment on the 8 Series. Whether your 840d is in Sport, M Sport, or any other specification, the glow plugs are determined entirely by the engine code, not the badge or interior grade. Focus on supplying your engine code to the breaker rather than your trim name.

The Gran Coupe (G16) 840d shares the same B57 diesel engine as the two-door G15 coupe 840d, so the glow plugs are engine-driven rather than body-style-driven. Body style does not affect which glow plugs are fitted, so a set pulled from a coupe breaker car could well match your Gran Coupe. Always confirm the engine code with the breaker against your registration to be sure.

The 840d uses the B57 straight-six diesel engine, which has six cylinders and therefore six glow plugs — one per cylinder. When sourcing from a breaker, it is worth checking whether they are selling a full set of six or individual plugs, as replacing all six at once is generally recommended. Confirm the count and part specification with the breaker using your engine code before purchasing.

Glow plugs are a diesel-only component and were never fitted to the petrol 840i at any point in its production. For a misfiring 840i, the parts you are more likely to need are ignition coils or spark plugs, both of which are available through UK breakers. Search for those parts quoting your engine code, and the breaker will be able to match the correct specification to your car.