The Mercedes — Benz M 278.932 is a 5,980 cc, V8 petrol engine produced between 2012 and 2017. It features dual overhead camshafts (DOHC), variable valve timing (VVT) on both intake and exhaust, and direct fuel injection with spray — guided combustion. In standard tune it delivered 386 kW (525 PS) and 700 Nm of torque, offering high — performance power delivery for flagship and AMG — tuned applications.
Fitted to key models including the W221 S — Class, W218 CLS — Class, and W212 E…
All models meet Euro 6b standards; 2014–2017 units with cylinder deactivation comply with Euro 6c (VCA UK Type Approval #VCA/EMS/7422).
The Mercedes-Benz M 278.932 is a 5,980 cc V8 petrol engine developed for high-performance and luxury platforms (2012–2017). It combines direct injection with variable valve timing to deliver strong power delivery and high-RPM performance. Designed to meet Euro 6b (and select Euro 6c) standards, it balances performance with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 5,980 cc | |
Fuel type | Petrol | |
Configuration | 90° V8, DOHC, 32-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 102.6 mm × 92.0 mm | |
Power output | 386 kW (525 PS) @ 6,000 rpm | |
Torque | 700 Nm @ 2,500–4,000 rpm | |
Fuel system | Direct injection (spray-guided, up to 200 bar) | |
Emissions standard | Euro 6b; Euro 6c with cylinder deactivation (2014–2017) | |
Compression ratio | 10.7:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Double-row roller chain with hydraulic tensioner | |
Oil type | MB 229.51 (SAE 0W-40) | |
Dry weight | 210 kg |
The Mercedes-Benz M 278.932 was used across Mercedes-Benz's W221, W218, and W212 platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-reinforced engine mounts in the W221 and shortened accessory drives in the W212-and from 2015 the facelifted W218 models adopted revised high-pressure fuel pump couplings, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M 278.932's primary reliability risk is high-pressure fuel pump drive coupling wear on early builds, with elevated incidence in stop-start urban use. Internal Mercedes-Benz quality reports from 2016 indicated a notable share of pre-2015 engines required HPFP replacement before 130,000 km, while UK DVSA records show fuel system-related faults contribute to emissions test failures in city-driven vehicles. Frequent cold starts and extended idling increase torsional stress on the drive mechanism, making oil quality and interval adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2013-2018) and UK DVSA failure statistics (2018-2022). Repair procedures should follow manufacturer guidelines.
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The M 278.932 offers smooth performance and strong power delivery, but early models (2012–2014) are prone to high-pressure fuel pump drive coupling wear. Later revisions (post-2015) feature improved coupling components and chain dampers, significantly enhancing durability. With regular maintenance and correct oil (MB 229.51 0W-40), well-maintained units can reliably exceed 180,000 km.
The most documented issues are high-pressure fuel pump drive coupling wear (causing stalling and misfires), oil leaks from valve cover gaskets, intake valve carbon buildup, and coolant pump impeller failure. These are confirmed in Mercedes-Benz service bulletins and field reports, with the HPFP issue being the most critical.
This 6.0L V8 petrol was used in several key models: S 600 (W221), CLS 600 (W218), E 63 AMG (W212), and GL 63 AMG (X166), primarily from 2012 to 2017. It was not licensed to other manufacturers and was succeeded by the M 178 AMG engine in performance applications.
Yes, the M 278.932 responds well to ECU remapping, typically gaining 30–50 kW safely. Performance intakes, exhausts, and camshafts can further increase output. However, tuning should not exceed the fuel pump's delivery capacity, and upgraded cooling is recommended for sustained high-load use.
High for a V8. In a W221 S 600, combined consumption is approximately 13.2 L/100 km (21.4 mpg UK), with city driving around 16.0 L/100 km and highway as low as 11.0 L/100 km. Real-world figures depend heavily on driving style, but expect 18–22 mpg UK under mixed conditions.
Yes. The M 278 series is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, resulting in severe internal damage. While chain failure is rare, HPFP drive wear can indicate underlying timing issues, so early diagnosis of stalling or fault codes is essential.
Mercedes-Benz specifies SAE 0W-40 oil meeting MB 229.51 standard. This low-SAPS formulation is critical for protecting the high-pressure fuel pump and hydraulic lifters. Oil changes should be performed every 15,000 km or annually to maintain component longevity and prevent sludge buildup.
Comprehensive technical documentation and regulatory references
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MERCEDES-BENZ Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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DVLA: Engine Changes & MoT
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Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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