Mercedes-Benz M278 Engine
Used & Reconditioned for Sale
4.7 biturbo, M278 DE44 AL, sub-codes .922–.928 series
Displacement
Fuel
Production
Fits S-Class W221/W222, E-Class W212, CLS C218 and more — verified fitment by registration, fixed prices, UK delivery.
Displacement
Fuel
Production
Configuration
Applications
Verified Fitment
Checked by registration
12-Month Warranty
On reconditioned units
UK Nationwide Delivery
2-4 working days
14-Day Returns
Uninstalled, full refund
Buy an M278 Engine for Your Vehicle
This M278 engine hub covers 4 application groups across Mercedes-Benz flagship saloons, executive models, roadsters and large SUVs. Each group is configured and priced for its specific vehicle fitment.
M278 — S-Class & CL
S-Class W221/W222 & CL C216 2010-2017 — S500/CL500
£4,500
Coming soonM278 — E-Class & CLS
E-Class W212 & CLS C218 2009-2018 — E500/CLS500
£4,200
Coming soonM278 — SL Roadster
SL R231 2012-2019 — SL500
£4,800
Coming soonM278 — Large SUV
ML/GLE W166 & GL/GLS X166 2012-2019 — 500 models
£4,300
Coming soonFull M278 Compatibility
Every M278 application listed below links to its specific unit page with registration-checker confirmation. All fitments are verified by chassis code — confirm your vehicle's M278 variant before ordering.
| Model | Chassis | Variants | Years | Config. | Unit page |
|---|
Confirm your exact specification with the registration checker above.
M278 Engine Prices
Prices are grouped by vehicle application. Each M278 variant has its own fitment specification — check your chassis code before ordering.
| Application | Used from | Reconditioned from |
|---|---|---|
| S-Class & CL | £4,500 | £7,200 |
| E-Class & CLS | £4,200 | £6,800 |
| SL Roadster | £4,800 | £7,500 |
| Large SUV (ML/GLE & GL/GLS) | £4,300 | £6,900 |
Prices shown are current lowest listed prices and update as stock changes. The price on each listing is the price you pay — no hidden fees at checkout.
What You Get with a M278 Engine
What You Get with a M278 Engine
What's included
Not included
Used or reconditioned?
For executive and flagship applications (Groups 1 and 2), used units are available from high-mileage donors offering strong value. For the specialist roadster and high-spec SUV applications (Groups 3 and 4), reconditioned units are more commonly selected given the vehicle values and the complexity of the twin-turbo V8 architecture. The M278 4.7-litre V8 biturbo is a high-performance, complex engine where replacement demand is typically driven by timing chain stretch, turbocharger wastegate rattle, and direct injection carbon buildup. A prepared M278 unit addresses these wear points, with timing components and turbo actuators inspected or renewed as standard before dispatch.
M278 Engine Buying FAQs
Answers to common fitment, condition, warranty and delivery questions.
A:The M278 engine fits Mercedes-Benz S-Class (W221, W222), CL (C216), E-Class (W212), CLS (C218), SL (R231), ML/GLE (W166), and GL/GLS (X166).
A:The M278 is also known as 4.7 biturbo, M278 DE44 AL, and carries application-specific sub-codes .922–.928 series. All share the same base V8 biturbo architecture.
A:For executive and flagship applications (Groups 1 and 2), used units are available from high-mileage donors offering strong value. For the specialist roadster and high-spec SUV applications (Groups 3 and 4), reconditioned units are more commonly selected given the vehicle values and the complexity of the twin-turbo V8 architecture. The best choice depends on your vehicle application and budget — use our reg checker to confirm fitment.
A:Use our registration checker on each listing, cross-reference with your V5C logbook, and verify the engine code stamp (M278 with sub-code) matches the listing scope. Contact for a free compatibility check if uncertain.
A:All units carry a 6–12 month warranty. UK nationwide palletised delivery. Free compatibility check before purchase.
Buy an M278 Engine — Ready to Ship
Enter your registration or select your vehicle to confirm the correct M278 variant for your car. All prices fixed with no hidden fees.