Mercedes-Benz GLS DPF Replacement Parts

The GLS has run across two main generations in the UK: the first-generation X166 (2016–2019) and the second-generation X167 (2019 onwards), and the emissions standards changed significantly across that boundary, moving from Euro 6a/b to later Euro 6d variants. A DPF from an X166 is very unlikely to be compatible with an X167, and even within each generation the correct match depends on your specific engine code. Always confirm the part against your registration with the breaker before buying.

Yes, the year matters because it determines your emissions standard (Euro 5 or Euro 6 and its sub-variants) and which engine code your vehicle runs, both of which directly affect DPF compatibility. A unit from the wrong emissions era may not fit correctly or could cause a failed MOT. Quote your registration and engine code to the breaker so they can match the part accurately.

No, trim level does not affect DPF fitment on the GLS — whether your car is an AMG Line, AMG Line Premium, or another specification, the DPF is determined by the engine code and emissions era, not the trim. You may find minor cosmetic differences in surrounding components such as undertray panels depending on specification, but the DPF itself is the same across trims sharing the same engine. Focus your conversation with the breaker on your engine code and model year rather than trim name.

This question spans the X166-to-X167 generation change that occurred in 2019, which also brought updated Euro 6 emissions compliance, so it is very unlikely these would interchange. The engine line-up and exhaust aftertreatment systems were revised between generations, meaning a 2018 (X166) unit is almost certainly not a direct fit for a 2020 (X167) car. Confirm this firmly with your breaker using both registrations and engine codes before purchasing.

All diesel GLS models sold in the UK will have a DPF fitted as standard, since the GLS only arrived in the UK from 2016 onwards, well within the mandatory DPF era. The exact specification of the DPF — including its housing, sensors, and mounting points — depends on your engine code, so make sure to provide that to the breaker. Never assume a used DPF will be a straight swap without the breaker verifying it against your specific vehicle.

No, you should not assume DPFs are interchangeable between different engine variants of the GLS — for example, a 350d unit is not the same as a 400d unit, as the exhaust systems are matched to each engine's output, size, and emissions tuning. Fitting a DPF from the wrong engine could result in poor performance, warning lights, or an MOT failure. This is strong confirm-with-breaker territory: give your registration and engine code and let the breaker verify the match.