Cheap Mercedes-Benz GLS Engine

The GLS X166 generation ran from 2016 to 2019, and the current X167 generation launched in 2020, so a 2020 engine comes from a fundamentally different platform and is very unlikely to be a straightforward swap into a 2016–2019 car. Fitment of an engine follows the engine code first and foremost, so check your V5 or run a VIN check to get your exact engine code, then confirm with the breaker whether a unit from the newer generation can cross that boundary. Never assume generation compatibility based on badge or capacity alone.

Yes, it matters significantly – the 350d and 400d use different engine codes and are not the same unit, even though both are diesel and both sit in the X167 generation. The engine code stamped on your block and listed on your V5 is the single most reliable guide, so always supply that code to the breaker rather than just the badge name. A breaker can cross-reference codes to confirm whether any overlap exists, but do not assume interchangeability from the fuel type or capacity alone.

Trim level does not affect engine fitment on the GLS – AMG Line is a styling and equipment package, not a separate mechanical specification, so it shares the same engine codes as a standard-trim car with the same badge. What matters is the engine code, fuel type, and gearbox type, all of which you can confirm from your V5 or a VIN check. You may find cosmetic ancillaries differ between trim levels, but the engine itself is determined by the powertrain, not the trim name.

Yes, both 2016 and 2019 GLS models fall within the X166 generation, which covered 2016 to 2019, so you are within the same platform. That said, always match on engine code rather than year alone, as Mercedes can introduce running changes mid-production that affect ancillaries and mountings – confirm specifics with the breaker against your exact registration. The engine code from your V5 is the safest starting point for any compatibility check.

This crosses the generation boundary between the X166 (2016–2019) and the X167 (2020 onwards), which are different platforms, so a straight engine swap across that boundary is very unlikely to be compatible. Beyond the physical differences, ECU pairing and immobiliser coding are also factors you must confirm with the breaker, as these are not things we can advise on definitively. Always give the breaker both registrations and your engine codes so they can assess the crossing properly.

Fuel type is a fundamental fitment factor for engines – a petrol engine from a GLS 450 or 580 will not swap into a diesel GLS 350d or 400d, as the blocks, management systems, and ancillaries are entirely different. Always match fuel type first, then confirm the exact engine code from your V5 or a VIN check before approaching a breaker. Mismatched fuel types are not a compatibility question; they are simply not interchangeable.