Used Mercedes-Benz GLS Fuel Filter

It depends on the engine. Diesel variants of the GLS (such as those running the OM642 or OM656 engine codes) do have a serviceable fuel filter, typically housed in the engine bay as part of the fuel system. Petrol (AMG and standard V8/inline-six) variants generally have a non-serviceable lifetime fuel filter integrated into the fuel tank assembly, so there is no standalone filter to replace in the conventional sense. If you are sourcing a used filter, confirm with the breaker whether the unit from a donor vehicle matches your exact engine code.

The GLS X166 ran from 2016 to 2019 and the current X167 generation launched in 2019, so these are entirely different platforms with different engine families and fuel system layouts. A filter from the X166 is very unlikely to be a direct fit for the X167 even if both are diesel, as the engine codes and fuel delivery architecture differ between generations. Always supply your engine code and registration to the breaker so they can confirm compatibility against the donor vehicle's spec.

This question spans a generation boundary: the X166 ran through to 2019 when it was replaced by the X167, so a 2019 car could be either generation depending on exact build date. If both vehicles are confirmed X166 with the same engine code, fitment is likely, but a 2019 X167 will need an X167-sourced filter. Confirm the generation and engine code with the breaker before purchasing.

Trim level — whether AMG Line, AMG Line Premium, or AMG Line Premium Plus — does not affect the fuel filter, as it is a mechanical component dictated entirely by the engine code and fuel type. What does matter is whether the car is a diesel or petrol and which specific engine variant is fitted, so an AMG Line diesel GLS and a base diesel GLS with the same engine code would use the same filter. Confirm your engine code with the breaker rather than relying on the trim name.

Diesel GLS models using the OM642 3.0-litre V6 (X166 generation) and the OM656 3.0-litre inline-six (X167 generation) both have a serviceable external fuel filter, typically mounted in the engine bay and accessible without dropping the tank. The engine code is the most reliable guide here — you will find it on your V5C or via a VIN check — so give this to the breaker to ensure the donor vehicle's filter and any associated housing matches yours. Ancillary bracket and housing changes mid-production are possible, so ask the breaker to confirm these details against your registration.

No — petrol and diesel fuel systems are fundamentally different, and the filters are not interchangeable. Petrol GLS models generally do not have a separately replaceable fuel filter at all, while diesel models have a dedicated filter housing designed for diesel fuel at higher system pressures. Always confirm you are sourcing from a diesel donor vehicle with a matching engine code to your own car.