Mercedes-AMG M 139 Engine Detailed, Develops Up To 421 PS
7 Jun 2019, 13:31 UTC · By: Mircea Panait / Not long now, the Mercedes-AMG M 139 engine will make its debut in the A 45 4Matic and A 45 S 4Matic with more than 400 ponies from 2.0 liters of displacement