Mercedes M276 3.0/3.5L Engine Specs, Problems, Reliability

Mercedes M276 3.0/3.5L Engine Specs, Problems, Reliability. The Mercedes-Benz M276 is a series of 3.0-liter and 3.5-liter gasoline V6 engines with direct fuel injection system. The M276 series was presented in late 2010 and since then it has actually been installed on the majority of contemporary designs those years (S350, CLS350, ML350, E350, W204 C350, and others) changing the previous M272 V6 engine series. Many engines in the brand-new series are turbocharged and only 3.5 L M276 was available in both natural aspirated and turbocharged variations.

Mercedes M276 3.0 3.5L Engine Specs

The M276 series started in 2010 from a naturally aspirated 3.5-liter variation (M276 DE 35) that was introduced initially on the 2010 Mercedes-Benz C350 CGI BlueEfficiency. The M276 3.5 L V6 engine had an aluminum cylinder block with cast iron cylinder liners initially. Nevertheless, in early 2013, Nanoslide cylinder wall finishing was used instead of liners. The producer declared that the Nanoslide finish reduces friction by as much as half and conserves a number of kilograms in the total weight of the engine.

The M276 engine block has a 60-degree V-angle that permitted eliminating a balance shaft in the design. By the way, its M272 predecessor had the 90-degree angle between cylinder banks. Engineers also implemented lots of plastic/composite products parts that formerly were made from aluminum and steel materials (such as the thermostat, heater valve, hydraulic lines, and belt pulley-block).

Mercedes M276 3.0/3.5L Engine Specs, Problems, Reliability

The M276 engine has aluminum alloy cylinder heads with 4 valves per cylinder (two consumption and two exhaust valves) and double overhead camshafts (DOHC) driven by a two-stage chain drive system. There are 3 equipment chains, each of which is equipped with hydraulic tensioner. Intake and exhaust camshafts have hydraulic vane-cell camshaft adjusters for the independent variable valve timing for the consumption and exhaust valves. Valves are actuated by low-friction roller web cam followers.

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The engine also consists of a third-generation direct injection system with piezo-electrically managed injectors. The piezo injectors deliver up to 5 fuel injections into the combustion chambers per consumption stroke (two to three injections per cycle in typical operation). The low-pressure pump (4.5 to 6.7 bar) supplies fuel to the high-pressure fuel pump located at the rear end of the best intake camshaft. Actuated by three additional web cams, the high-pressure pump produces 120-200 bar of fuel pressure for the fuel rails to the injectors. The air-fuel mix ignites by a multi-spark ignition that creates up to 5 sparks per cycle.

Naturally aspirated 3.5 L variations include a three-stage variable consumption manifold (engine speeds below 3,200 rpm; at 3,200-4,250 rpm; and above 4250 rpm). The M276 engine also includes a vane-type, demand-controlled oil pump, an enhanced water pump, and a variable alternator.

The 3.0-liter version was released in 2013. The M276 DE 30 LA engine utilizes the exact same architecture of the 3.5 L V6, but with a lowered bore and stroke at 88 mm x 82.1 mm (3.46 in x 3.23 in). Likewise, this DELA30 engine was turbocharged with twin IHI turbochargers. Each cylinder bank is fitted with its turbocharger which offers peak boost pressure of 1.8 bar (26.1 psi). For 2015-2016, Mercedes provided a greater output variation – DE30LA AMG. The compression ratio was lowered to 10.5:1 and turbochargers were tuned on higher increase. This engine delivered 362 hp and 384 lb-ft of torque.

In 2014, Mercedes introduced a biturbo version of the NA 3.5 L M276 V6 – the M276 DELA35 or DE35LA engine. This new engine became the follower for the DE30LA. Like the 3.0-liter twin-turbo M276 engine, the DE 35 LA engine also includes a 10.7:1 compression ratio, direct injection, and twin IHI turbochargers. In spite of the big displacement, a lower increase pressure offers lower fuel intake for the 3.5 L engine compared to its 3.0 L predecessor.

Mercedes M276 Engine Problems and Reliability

The M276 V6s are good, trustworthy engines with not many concerns. The most problematic location is a two-stage chain drive system of the engine. This system had some concerns with inadequate oil provided for the chains, which triggers them to use rapidly. In this case, some engines had an issue with rattling or loud timing chains on start up. Mercedes addressed that issue by installing the new check valves and optimized chain tensioners. If you miss out on the tensioners failure, it can result in expansive repair work of the whole engine timing system.

Keep in mind that direct injection nozzles are sensitive to fuel quality. Refuel your car in checked places and utilize just the recommended kind of gasoline. Also, there were very uncommon reports of scratches on the cylinder walls due to the ingress of driver crumbs/dust.

The approximate lifespan for the turbocharged 3.0-liter and 3.5-liter variations is 160,000-180,000 miles (250,000-290,000 km). Naturally aspirated versions normally reach 200k miles mark. How long this M276 high-technology engine will last depends on lots of factors: correctness of needed maintenance, quality of parts, driving conditions, and etc.

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Mercedes M276 3.0/3.5L Engine Specs

Manufacturer Daimler AG
Production years 2010-present
Cylinder block material Aluminum
Cylinder head material Aluminum
Fuel type Gasoline
Fuel system Direct Injection
Configuration V
Number of cylinders 6
Valves per cylinder 4
Valvetrain layout DOHC
Bore, mm 88.0 mm (3.46 in) – 3.0L
92.9 mm (3.66 in) – 3.5L
Stroke, mm 82.1 mm (3.23 in) – 3.0L
86.0 mm (3.39 in) – 3.5L
Displacement, cc 2,996 cc (182.8 cu in)
3,498 cc (213.4 cu in)
Type of internal combustion engine Four-stroke, naturally aspirated/turbocharged
Compression Ratio 10.7:1 – M276 DE35LA and M276 DE30LA
12.0:1 – M276 DE 35 red.
12.2:1 – M276 DE 35
Power, hp 272-367 hp (200-270 kW)/5,000-6,000 – M276 3.0 version
252-333 hp (185-245 kW)/6,000-6,500 – M276 3.5 version
Torque, lb ft 295-384 lb-ft (400-520 Nm)/1,300-4,000 – M276 3.0 version 251-354 lb-ft (340-480 Nm)/1,200-5,200 – M276 3.5 version
Engine weight
Firing order
Engine oil weight MB 229.5/229.51, SAE 0W-30, 0W-40, 5W-30, 5W-40
Engine oil capacity, liter 6.5 l (6.9 qt)
Oil change interval, mile 9,000 (15,000 km) / 12 months
Applications CLS 300, CLS 350, CLS 400, ML 350, ML 400, GL 400, C 350, C 400, C 450 AMG, E 300, E350, E 400, S 350, S 500 PLUG-IN HYBRID, SL 400, R 400, GLE 400 Coupe, GLE 450 AMG (Coupe), S 400 4MATIC Coupe, ML 300 4MATIC, GLK 350, SLK 350.
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Mercedes M276 3.0/3.5L Engine Modifications

  • M276 DE 30 AL – 333 hp (245 kW) at 5,250-6,000 rpm, 354 lb-ft (480 Nm) at 1,600-4,000 rpm. Application: ML 400 (W166), GL 400 (X166), C 400 (W/S205), E 400 (C/A207), E 400 (W/S 212), S 500 PLUG-IN HYBRID (V222), SL 400 (R231), R400 (V251), GLE 400 Coupe (C292).
  • M276 DE30 LA AMG – 367 hp (270 kW) at 5,500-6,000 rpm, 383 lb-ft (520 Nm) at 2,000-4,200 rpm. This engine was offered for the Mercedes-Benz C 450 AMG (W/S 205), GLE 450 AMG (W166), GLE 450 AMG Coupe (C292), and S 400 4MATIC Coupe (C217).
  • M276 DE 35 red. – 252 hp (185 kW) at 6,500 rpm, 251 lb-ft (340 Nm) at 3,500-4,500 rpm. This is a NA 3.5 L engine, detuned variation. It was utilized by ML 300 (W166), A207/C207 E 300, W212 E 300, and C218 C300, CLS 300.
  • M276 DE 35 – 306 hp (225 kW) at 6,500 rpm, 273 lb-ft (370 Nm) at 3,500-5,250 rpm. This version is the most prevalent naturally aspirated 3.5 L V6, also understood by BlueEfficiency badge. Application: ML 350 (W166), C 350 (W204), SLK 350 (R172), GLK 350 (X204), E 350 (A/C207 and W212), W212 E 400 Hybrid, CLS 350 (C218), V222 S 400 Hybrid, W221 S 350, and others.
  • M276 DE 35 LA – 333 hp (245 kW) at 5,250-6,000 rpm, 354 lb-ft (480 Nm) at 1,200-4,000 rpm. This is a 3.5 L twin-turbo V6 engine for the E 400 (C/A 207, W212) and CLS 400 (C218).