The M152 is a V8 engine produced by Mercedes-Benz from 2012 to 2015. Design The M152 is essentially a naturally aspirated variant of the M157 engine and but has been revised by AMG. It has the same bore and a stroke of as the M157 but with a higher 12.6:1 compression ratio. Compared to its predecessor, the M152 features new cylinder heads, intake manifold, and lubrication system. It also now has direct injection, and Cylinder deactivation. Models M152 DE55 2012–2015 R172 SLK 55 AMG References Mercedes-Benz engines V8 engines Gasoline engines by model