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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallMercedes-Benz’s inline-six is not one engine but a succession of designs. The examples here range from the twin-cam M 110 introduced in the early 1970s to the turbocharged, electrically assisted M 256 family used in modern Mercedes models. Their specifications belong to particular versions and vehicles, not to every Mercedes inline-six.
1. The Mercedes inline-six spans very different generations
The M 110 and M 256 illustrate how much the label “inline-six” can cover. Mercedes-Benz Classic describes the M 110 as a 2.8-liter engine with two overhead camshafts that debuted in early 1972 in the Stroke Eight models. The later M 256 is a 3.0-liter gasoline engine designed around turbocharging and a 48-volt electrical system.
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These are selected milestones, not a complete catalogue of Mercedes-Benz six-cylinder engines.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errors2. The M 110 had two camshafts and two documented output versions
Mercedes-Benz Classic material identifies the M 110 as a 2.8-liter inline-six with two overhead camshafts. In that historical account, the carburetor version produced 118 kW (160 hp), while the fuel-injected version produced 136 kW (185 hp). Those figures describe the versions in the historical source; they are not current specifications or a direct comparison with later engines.
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Mercedes-Benz Classic: M 110 historical engine account (PDF)
3. The M 256 uses electricity to assist a gasoline engine
Mercedes-Benz announced the M 256 in 2017 as a 3.0-liter gasoline inline-six with an integrated starter-generator (ISG), a 48-volt electrical system and an electric auxiliary compressor (eZV). The announcement described an intended S-Class application; that launch plan was forward-looking at the time, rather than a current availability statement.
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- Engine Compatibility: Designed to work seamlessly with Benz M256 Engine 4.0L models, including the AMG GT 53, E53 AMG, AMG GT 43, and 3.0L variations.
Mercedes said the ISG supports functions such as boost and energy recuperation. The 48-volt network also supplies high-load accessories, while the arrangement removes belt drive for front-mounted auxiliary components. The engine’s unit displacement is 500 cm³ per cylinder, according to the company’s announcement.
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Mercedes-Benz France: modular-engine announcement
4. M 256 power and torque depend on the vehicle and version
There is no single output figure that applies to every M 256. Mercedes-Benz’s U.S.-market announcement for the 2021 E-Class update rated the E 450’s 3.0-liter turbocharged M 256 at 362 hp, with EQ Boost and a 48-volt onboard system. That is a dated, U.S.-specific vehicle specification.
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For the 2026 S-Class, Mercedes-Benz reports up to 443 lb-ft of torque for the S 500 4MATIC’s M 256 Evo, with up to 472 lb-ft available briefly through overtorque. The company attributes revisions to the electric auxiliary compressor, intake and exhaust ports, and intake camshaft. These are torque figures for that application, not a universal rating for the M 256 family.
| Application | Engine and context | Published figure |
|---|---|---|
| U.S.-market 2021 E 450 | 3.0-liter turbocharged M 256; EQ Boost and 48-volt onboard system | 362 hp, Mercedes-Benz’s rated output for this application |
| 2026 S 500 4MATIC | M 256 Evo | Up to 443 lb-ft; up to 472 lb-ft briefly with overtorque, as reported by Mercedes-Benz |
Mercedes-Benz USA: 2021 E-Class update
Mercedes-Benz USA: 2026 S-Class announcement
5. The S 580e’s 576 hp is a hybrid-system figure
Mercedes-Benz says the S 580e 4MATIC plug-in hybrid combines an upgraded inline-six with an electric motor for 576 hp. That number describes the combined system output; it is not the standalone output of the inline-six. The distinction matters whenever engine figures are compared with a hybrid’s headline rating.
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- 【❗Fitment (Vehicle Compatibility)❗:】 Direct Replacement Intended To Fit Mercedes-Benz E450 Models Equipped With The 3.0L Inline-6 (Mhev) Engine And Specified As Having The Amg Styling Package; Intended For The Front Driver Side Outer Locationverify Engine Type And Package Compatibility.
- ✅【 Function (Part Description):】 Designed As A Direct Replacement To Shield The Front Outer Engine Bay On The Driver Side For Inline-6 Mild-Hybrid (Mhev) Equipped Models.
- ✅【 Replacement Reason (Service Description):】 Replaced When The Original Splash Shield Is Damaged, Missing, Or When Mounting Tabs And Attachment Points Have Weard.
- ✅【 Construction and Material:】 Manufactured From Oe-Style Molded Plastic With Factory-Style Attachment Points To Align With Original Mounting Locations And Contours.
- ✅【 Testing and Installation:】 Inspected For Proper Fit And Alignment; Installs Using Factory Fasteners Or Compatible Clips And Should Be Installed Per The Vehicle Manufacturer'S Guidance.
Mercedes-Benz USA: 2026 S-Class announcement
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.6. Mercedes also made a diesel inline-six: the OM 656
The M 256 is a gasoline engine; the OM 656 is a diesel inline-six. Mercedes-Benz’s modular-engine portfolio included both types, but the separate codes identify distinct engines, not fuel variants of one engine. The available source supports that distinction, not a full technical comparison between the two families.
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Mercedes-Benz Media: modular engine family
7. The figures are not a like-for-like efficiency comparison
The cited examples come from different periods, vehicles and markets, and the sources do not establish a comparable fuel-economy test across them. A historical M 110 output, a U.S.-market E 450 rating, an S 500 torque figure and a plug-in hybrid system rating answer different questions. Read each number with its engine code and vehicle context rather than treating it as a ranking of Mercedes inline-sixes.
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- 【❗Fitment (Vehicle Compatibility)❗:】 Direct Replacement Suitable For Listed Mercedes-Benz Inline-6 Models (250, 280Sl, 280C, 300Te, 300Se, Sl320 And Other Inline-6 Applications) . Verify Vehicle Model And Engine Type To Ensure Compatibility.
- ✅【 Function (Part Description):】 Designed To Close And Seal The Engine Oil Filler Opening, Supporting Normal Lubrication System Operation By Reducing The Risk Of Oil Leakage And Dirt.
- ✅【 Replacement Reason (Service Description):】 Commonly Replaced When The Original Cap Or Its Gasket Is Brittle, Cracked, Loose, Or No Longer Forms A Reliable Seal.
- ✅【 Construction and Material:】 Built To Oe-Style Specifications Using Durable Thermoplastic And An Elastic Sealing Gasket To Provide A Secure Surface With The Filler Neck.
- ✅【 Testing and Installation:】 Inspected For Correct Fit, Thread Engagement, And Gasket Seating. Install By Hand-Threading Until Fully Seated And Secure; Consult Factory Guidance For Final Tightening If Required.
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