Mercedes says the twin-turbo M256 makes enough horsepower to serve as a V8 replacement–generating over 408 hp and 369 lb-ft of torque from 3.0 liters . Mercedes Benz Classics: Owners Operation, Service, and Repair Workshop Manuals ... M157 DE 55 AL, M256, M276 DE 30 AL, M276 DE 35, M278 DE 46 AL, OM642 LS DE 30 LA, OM651 DE 22 LA, OM656; E-Class. Yet the straight six delivers at least a 20 percent improvement in specific fuel consumption and a 20 percent decrease in CO2 emissions. In fact, it’s hard to suss out what the engine is doing at any given moment. Lastly, there’s the opportunity to fit M256-equipped vehicles with 48-volt chassis systems, like Bentley’s roll control or true drive-by-wire electric brakes. Or a supercharger. The owner comments describe problems respondents experienced with this vehicle. The M276 engine is not related to the Chrysler Pentastar except for the 60 degree angle, as it was developed while Chrysler was still owned by Daimler AG. It engages the stop/start feature in milliseconds, imperceptibly, and it allows the engine to stop while the car is coasting down. How about the electric compressor, mounted on the intake side of the M256. Vollrath calls it the “hot” and “cold” sides. This is by far one of the most common problems with Mercedes-Benz models, including E25, E30, and E35. Call (707) 430-0101 for Mercedes-Benz Sales, Service and Parts related questions. Torque defines the E53. What else? Search over 19,400 listings to find the best Los Angeles, CA deals. It’s cast entirely of aluminum and displaces 2,999 cc, or about .5 liter per cylinder; subtract two pots and you have a 2.0-liter four. The CLS will be a nimble combination of unique parts and platform sharing. Add the quick burst from the ISG, and the M256’s peaks actually surpass those from the V8. In both regular Mercedes and AMG-tuned guises, the M256 has an "Integrated Starter-Generator" (ISG) bolted to its crankshaft. Now the bottom line: The M256 debuts in two variants in the S-Class -- one generating 367 peak hp and 369 lb-ft of torque, and the other 435 hp, 384 lb-ft. Coming up soon is the most desirable new I6: is the ‘M256' code gasoline engine. We may earn a commission through links on our site. Out on the highway, the E53’s power is ample, with effortless passing afforded by all its torque-boosting accoutrements. On the highway, you might get good fuel economy if you put the E53 in Eco mode. Autoweek participates in various affiliate marketing programs, which means we may get paid commissions on editorially chosen products purchased through our links to retailer sites. Turbo, electric compressor, 48 volts and streamlined assembly: This is what internal combustion's future looks like. Hot and Cold: On Mercedes-Benz's M256 inline six, the primary turbo and close-coupled catalyst are packaged on the hotter exhaust side, while the electric supercharger, intercooler and more heat sensitive components are packaged on the cooler intake side. On the hot or exhaust side, Mercedes has packaged the M256’s turbo and a close-coupled catalyst that achieves light-off temperature as quickly as any in production, according to Vollrath. That’s great for packaging as it helps keep length in check, which is always a concern for straight sixes. There’s a more conventional twin-scroll turbo on the other side of the M256 to do most of the heavy lifting, with peak boost of 29 psi. The problem comes with things like how high-pressure vessels do in things like real-world crashes, especially with the extreme lack of maintenance … The old-time enthusiasts rued its demise. Mercedes M256 Problems and Reliability The M256 engines are still new and do not have enough statistics on common problems and failures. The key driver is the 48 volts, which means four times the electromotive force of a conventional 12-volt system. The ISG produces 21 horsepower and an impressive 184 lb-ft of torque, helping to start the engine almost instantaneously and providing extra muscle. And to the electric water pump, which generates twice the power and flow of a conventional belt- or gear-driven water pump. All of the … Save $10,680 on a 2016 Mercedes-Benz C-Class C AMG 450 near you. That included a few attempts at stretching the E53’s legs. The 2022 Nissan Frontier Finally Gets a New Design, This Shop Builds V-12 LS Engines of your Dreams, The Second-Gen F-150 Raptor Outsold the First, The Latest Volume of the New Road & Track Is Here, Mazda MX-5 Miata: Guide to Every Generation, This content is created and maintained by a third party, and imported onto this page to help users provide their email addresses. Haven't seen an electrically driven automotive AC compressor before? Weak spots, Issues & problem areas on the M256 The M256 engines are generally reliable and solid as long as they are regularly serviced and maintained. A cutaway of the electrically operated supercharger nestled under the intake manifold on Mercedes-Benz's new inline six. Perhaps there isn’t enough power separation to justify the more expensive V8. Now, as the market and regulatory climate drive displacement back toward the smaller end of the spectrum, the inline six allows the modular concept to be tied to four-cylinder engines. Mercedes says there’s a maximum of 384 lb-ft, which is available from 1800 to 5800 rpm, but it feels like it has more. Yet because it’s electrically operated, the M256’s supplemental compressor goes from off to full boost in .3 seconds, according to Vollrath. This system had some issues with insufficient oil supplied for the chains, which causes them to wear quickly. Vollrath says the electric compressor couldn’t have gone on the hot side without water cooling or other serious heat mitigation because it isn’t robust enough. It’s only 6 percent less peak power than a new, 4.0-liter twin-turbo V8 headed to the States in the updated S560. Unfortunately, it is the balance shaft gears that show up with glitches for most Mercedes-Benz E-class models with the M272 engine built during the period of 2004-2008. Mercedes-Benz was once enamored of the straight-six gasoline-powered engine. Whatever the thinking, Mercedes development director Ola Källenius says we will see the M256 in the not-too-distant future. Blame a 4519-pound curb weight, as measured by our colleagues at Car and Driver. 2019 Mercedes-Benz CLS Prototype Review: The Return of Mercedes’ Swoopy Coupe . Only there’s no M256 for North America, for now. It will not. The electric supercharger, for example, draws 5 kilowatts, or nearly 7 hp. Autoweek may earn money from the links on this page. The Mercedes-Benz M256 engine is a turbocharged straight-six engine produced since 2017, when it was first introduced on the W222 S450. The M256 generates at 48 volts, then down-converts to 12 volts through a power-electronics pack for conventional systems like the stereo or engine ignition. Its location smack in the middle of the driveline has value in itself. One is that it is a quick method ofreplacement, as the comprehensive nature of the engine package with pre-assembled components means that it is simply a case of removing the old engine and installing the new one.This saves you time and reduces expenses. The Reliability score is based on our latest subscriber survey of 2020 Mercedes-Benz GLE owners. Audi's AI:ME concept previews the autonomous city cars of the future, Karma wows Shanghai with one production car and two concepts, ID Roomzz previews Volkswagen's first large electric SUV, Filling the gaps: Mercedes-Benz GLB concept debuts in Shanghai. Carbon build up in the head, particularly around the valves which will sap power or create flat spots, this is a larger issue on direct injection engines but should be looked out for on all engines. We’re getting a 3.0-liter turbo V6 for the bottom-rung 2018 S-Class, with less power and torque than either M256, and this publication cannot explain why, except to say that it appears to be purely a marketing decision. We analyze millions of used cars daily. The M256 springs from Mercedes-Benz’s new Family of Modular Engines (FAME), which includes a high-output AMG version as well as a diesel inline-6. Finally, the ISG can augment the engine’s motive power, hybrid-style, with its additional 22 hp and 180 pounds of torque in short bursts (based on the lithium battery’s 1 kWh capacity). The ISG also powers the water pump and A/C compressor, which means there are no belts at the front of the engine. In concept, it's similar to the belt-driven supercharger on Volvo’s most powerful turbo fours, which supplements the turbocharger as it builds boost. Its 429-hp 3.0-liter straight-six might not be a full AMG-designed monster like the brand’s 4.0-liter twin-turbo V-8, but with a twin-scroll turbo, electric motor, and an electric compressor, it makes the most of today's available tech. The trick is when to use either or both compressors, and that’s left to some complicated software developed by a staff of 10 in-house engineers, according to Vollrath. A new 48-volt electrical system helps enable that electric compressor. It replaces the previous M276 V6 engine . The advantages of 48 volts have nothing to do with the M256’s inline configuration, to be sure. And all cars have issues. SAN FRANCISCO – Invoking the description “cultured sporty” for its redesigned 2019 CLS four-door coupe, Mercedes-Benz will revive its swoopy styling while delivering an array of new engines. Mercedes’ turn toward V6s began with the launch of the U.S.-built M-Class in 1997, and by the time the W210 E-Class ceased production in 2002, the straight six had disappeared. It won’t help you figure out what’s generating the boost though, as it seems to switch between showing levels from the ISG, electric compressor, and turbocharger. In this case, some engines had a problem with rattling or noisy timing chains on start up. The switch between the various power-adding appendages happens seamlessly. When the balance shaft gears start failing, you’ll probably hear a puttering sound – always a tell-tale sign of engine troubles.The specific culprit for this problem is … Like most engines an M256, should have few issues if it gets properly serviced and looked after. Really, this is more of a comfortable GT car than anything else. My only real gripes with the M256 is that it doesn’t rev as freely nor sound as good as BMW’s B58 3.0-liter straight-six, but those are minor. 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