Used Mercedes-Benz GLS Flywheel

It depends on the variant: GLS models fitted with a manual gearbox have a traditional solid flywheel, while those paired with an automatic gearbox use a torque converter flex plate (sometimes loosely called a flywheel) instead of a conventional flywheel. Most GLS variants sold in the UK came with an automatic gearbox, so the majority of buyers will actually be looking for a flex plate rather than a solid flywheel. Confirm with your breaker which component you need by telling them your gearbox type alongside your engine code.

The engine code is the single most important detail — it determines the exact bolt pattern, diameter, and tooth count of the flywheel or flex plate, and it sits above the badge or displacement figure in terms of fitment. You can find the engine code on your V5C or via a VIN check, and breakers will ask for it as a first step. Also confirm whether your GLS has a manual or automatic gearbox, as this determines whether you need a solid flywheel or a flex plate.

The X166 and X167 generations are distinct platforms with different engine line-ups and gearbox configurations, so a direct swap across that 2019 boundary is very unlikely to be compatible. Even where an engine code appears in both generations, ancillary and mounting details can differ between production runs, so you should confirm cross-generation fitment directly with the breaker against your exact registration. Never assume a part from a different generation will interchange without that check.

Trim and specification level do not affect flywheel or flex plate fitment — what matters is the engine code and gearbox type, not whether the vehicle is a standard GLS or a higher-specification AMG Line or similar. The 350d and 400d badges indicate different engines with different codes, so those two would require different components, but that is an engine difference rather than a trim difference. Give your breaker the engine code rather than the badge name for the most accurate match.

The X166 generation ran from 2012 to 2019 and the X167 generation launched in 2019, so cars registered around that period need careful checking rather than assumption based on year alone. A VIN check or V5C will confirm your exact build date and generation, and your engine code will then tell a breaker precisely which flywheel or flex plate was fitted. Because mounting and ancillary details can shift mid-production, always confirm with the breaker against your registration rather than relying on year alone.

No — petrol and diesel engines have different firing characteristics, power outputs, and crankshaft flange dimensions, meaning their flywheels and flex plates are engineered specifically for each fuel type and will not interchange. Even if the physical diameter looks similar, tooth counts and bolt patterns are typically different, and fitting an incorrect unit risks serious drivetrain damage. Always match the replacement to your exact engine code and fuel type, and confirm with the breaker before purchasing.