Mercedes-AMG GT 43 Engine Replacement - M256M 3.0 Engines

Mercedes-AMG GT 43 Engines for Sale | Engine Finders

If you're looking for a reconditioned Mercedes-AMG GT 43 engine, a rebuilt M256M unit, or simply a reliable replacement for a worn-out Mercedes-AMG GT 43 M256 mild-hybrid straight-six engine, you're in the right place. The AMG GT 43 sits at the entry point of the current four-door AMG GT range, offering six-cylinder efficiency alongside the V8-powered GT 55 and GT 63 above it. Engine Finders matches UK buyers searching for 'M256M engine for sale', 'reconditioned M256M price' or 'Mercedes-AMG GT 43 engine replacement cost' with vetted suppliers who carry the correct unit for your exact car — supply-only or supply-and-fit, used or professionally reconditioned, whichever suits your budget and timeline.

Mercedes-AMG GT 43 Replacement Engines

A replacement M256M engine for the Mercedes-AMG GT 43 is a significant purchase, so getting the exact code right matters more than the badge on the boot. This is the entry point into the current AMG GT 4-Door Coupé range, using the same M256 mild-hybrid straight-six family found in other current Mercedes-Benz and AMG models such as the S 500 and E 53. Whether you call it a rebuilt engine, a remanufactured unit, or a reconditioned replacement, the work involved is broadly the same: a full strip-down, inspection against factory tolerances, replacement of wear parts, and bench testing before it's fitted or dispatched to you.

AMG GT 43 Models & Engine Codes

The Mercedes-AMG GT 43 uses the M256M (3.0-litre straight-six, Petrol turbo, 48-volt mild hybrid), fitted to AMG GT 43 4-Door Coupé (C192) across 2024 to present. The same M256 family, at a different tune, powers the AMG GT 53 above this model — confirm the exact output rating from your engine number before ordering. Before ordering any used, reconditioned or rebuilt unit, confirm this code from your V5C or the number stamped on the engine block itself — the same badge can sometimes cover more than one engine across a model's production run, and getting this step right avoids an expensive mismatch.

Buy Used and Second-Hand Mercedes-AMG GT 43 Engines

Used M256M engines do come up for sale in the UK, generally sourced from donor or written-off Mercedes-AMG GT 43 cars. A used engine can look like the cheaper option at first glance, but once you've accounted for inspection, gaskets, ancillaries and the lack of a meaningful warranty, a professionally reconditioned or remanufactured M256M unit is often the better value over the life of the car.

Mercedes-AMG GT 43 Engines in Stock

We work with a UK-wide network of suppliers who carry reconditioned, rebuilt and remanufactured M256M engines for the Mercedes-AMG GT 43, along with used units where buyers prefer that route. Give us your registration and we'll confirm current stock, typical lead times, and whether supply-only or supply-and-fit makes more sense for your situation.

Warranty for Replacement Mercedes-AMG GT 43 Engines

Warranty terms for a replacement M256M engine are set individually by the supplier we match you with — typically around 12 months on a reconditioned or remanufactured unit. £6,500 is our approved M256 price, treating the 'M256M' reference in our source material the same as plain M256, consistent with how we handle this distinction on our CLE 53 AMG page. Reported output is around 422 PS. Always get the warranty length, what it covers, and the VAT and fitting basis confirmed in writing before you commit.

Mercedes-AMG GT 43 M256M Engine Problems & What to Check Before Buying

This is a recent, low-mileage application, and we have not found catalogue-grade documented issue reports we are prepared to publish here. We note this as general background for anyone researching a M256M replacement, not as a confirmed finding for any specific car — ask your supplier what inspection was carried out on the unit you're being quoted, and whether known wear points for this engine family were addressed during the rebuild.

What's Included in a Reconditioned Mercedes-AMG GT 43 M256M Engine

A genuine reconditioned or remanufactured M256M unit should include a full strip, clean and inspection against factory tolerances, replacement of gaskets, seals and wear items, and a bench test before it leaves the workshop. What's not always included — ancillaries like the turbo, injectors or auxiliary belt components, and whether the price is supply-only or supply-and-fit — varies by supplier, so ask for this in writing alongside your M256M engine quote rather than assuming it's covered.