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No two dpfs are quite the same across different vehicles, so getting the specifics right matters when you buy used, second hand or a replacement. Answer a few quick questions below and breakers will only quote if they have the exact matching part in stock:
This is a critical year boundary to flag: the W166 ML ran from 2011 to 2015, but Euro 5 and Euro 6 emission standards shifted during that production run, and a DPF from the earlier Euro 5 period may not be a straight swap onto a later Euro 6 car even within the same generation. The engine code is the other key factor, as the 250 CDI, 350 CDI, and other variants each use their own exhaust aftertreatment setup. Confirm the engine code and emissions standard on both vehicles with the breaker before ordering.
No, trim level does not affect DPF fitment on the ML — SE, Sport, AMG Line, and similar grades all share the same DPF for a given engine and emissions era. You may find cosmetic differences around the exhaust area between trims, but the DPF itself is determined by engine code and emissions standard, not the trim badge. Focus your search on matching those details rather than trim name.
The ML ran across two main generations relevant to most UK buyers looking at used parts: the W164 (2005–2011) and the W166 (2011–2015, facelifted in 2013). Generation absolutely matters for DPF fitment because the two share no meaningful exhaust componentry, and even within the W166 the 2013 facelift can coincide with engine and emissions spec changes. Always match the generation and engine code first.
No — the W164 (2005–2011) and W166 (2011–2015) are entirely different platforms with different engines and exhaust systems, so a W164 DPF will not cross to a W166. Even where engine names look similar between the two generations, the actual units and their aftertreatment hardware are not interchangeable. Confirm the generation and engine code with the breaker so they can source from the correct donor vehicle.
The W166 ML was facelifted in 2013, and while the facelift was largely cosmetic, it can coincide with running production changes to engine specs and emissions calibration that affect DPF compatibility. A pre-facelift DPF may physically resemble the later part but could differ in a way that causes issues with your car's emissions system or MOT compliance. This is strong confirm-with-breaker territory — give them your full registration and engine code before committing.
Engine code is the single most important thing to match on a used ML DPF, as the 250 CDI (OM651), 350 CDI (OM642), and other variants each have their own DPF specification. You'll find your engine code on the V5C or on a sticker under the bonnet, and a good breaker will cross-reference this against the donor vehicle before quoting. Confirm exact codes with the breaker, as interchange specifics between closely related engine variants are not always straightforward.