Mercedes-Benz M156 engine

The M156 is the first V8 automobile engine designed autonomously by Mercedes-Benz subsidiary Mercedes-AMG, as previous AMG engines have always been based on original Mercedes engines. The engine was designed to be a naturally-aspirated racing unit, and will also be used in a number of high-performance "AMG"-badged Mercedes-Benz models.

The M156 displaces 6,208 cc (6.208 L; 378.8 cu in) and shares very little with other Mercedes-Benz engine families like the M155. The bore spacing, block design, and other features are unique to the AMG engine.

Although it displaces 6.208 liters, the engine will be marketed as the "6.3" to commemorate the famed M100 used in the 300SEL 6.3.

102.2 mm (4.02 in) bore and 94.6 mm (3.72 in) stroke. Output is 375 kW (503 hp) at 6800 rpm with 630 N·m (464.7 lb·ft) of torque at 5200 rpm.

The engine, however, has been uprated to produce 525 hp (391 kW) (and 465 lb·ft (630 N·m) of torque) in the late 2007 S 63, E 63, SL 63, CLS 63 & CL 63 models.

Mercedes has claimed it is the world's most powerful naturally-aspirated V8 engine.

Applications:
 * 2006 E 63 AMG
 * 2006 ML 63 AMG
 * 2006 R 63 AMG
 * 2006 S 63 AMG
 * 2006 CL 63 AMG
 * 2007 CLK 63 AMG
 * 2007 CLS 63 AMG
 * 2008 C 63 AMG
 * 2008 SL 63 AMG

M159
It is a version used in Mercedes-Benz SLS AMG. Compared to the standard AMG engine, the SLS's engine includes an all-new intake system, reworked valve train and camshafts, the use of flow-optimised tubular steel headers and dethrottling of the exhaust system. The engine also utilizes a dry-sump lubrication system to lower the center of gravity of the car.

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