Cheap Mercedes-Benz GLS Glow Plugs

Yes, but only on diesel variants — glow plugs are a diesel-engine component used to pre-heat the combustion chamber, and petrol GLS models (including all V8 and V6 petrol engines) never had them. If your GLS is a diesel, such as those fitted with the OM642 or OM656 engine family, it will have glow plugs; if it is petrol-powered, you will not find this part on your vehicle at all. Check your V5 or run a VIN check to confirm your fuel type before searching.

These sit in different generations — the first-generation GLS (X166) ran from 2016 to 2019, while the second-generation GLS (X167) launched in 2020 — so a 2017 X166 part is unlikely to cross over to a 2021 X167 without careful verification. The engine codes differ between generations, and glow plug fitment follows the engine code above all else, so confirm the exact engine code from your V5 or a VIN check before ordering. Confirm compatibility with the breaker against your registration.

No — trim level has no bearing on glow plug fitment for the GLS; what matters is the engine code, not whether the car is an AMG Line, Grand Edition, or standard specification. All diesel GLS variants sharing the same engine code will use the same glow plugs regardless of trim. Supply your engine code and registration to the breaker and they can confirm the correct part.

A 2019 GLS diesel sits in the first-generation X166 range, which ran from 2016 to 2019 before the X167 replaced it from 2020 onwards — so this does matter, as the two generations used different engine families and glow plugs are not interchangeable between them. Double-check your engine code on the V5 or via a VIN check, as this is the single most reliable detail to give a breaker when sourcing the correct glow plugs. Confirm the exact part with the breaker against your registration.

The number of glow plugs matches the number of cylinders — the GLS 350d, which uses the OM642 V6 diesel, requires six glow plugs, while the GLS 400d with the straight-six OM656 also uses six. You will need a full set if replacing all of them, though some buyers source used glow plugs individually; confirm the cylinder count for your specific engine with the breaker when requesting a quote.

The GLS is effectively a rebadged continuation of the GL, with the X166-generation GL transitioning to the GLS name in 2016, so diesel variants sharing the same engine code may well use the same glow plugs. The engine code is the key detail — if the GL and GLS units share an identical code, the parts are likely compatible — but confirm this with the breaker against both registrations before purchasing, as ancillary specifications can vary.