Mercedes-AMG’s 5.5 litre twin-turbo V8 is a newborn by most powertrain standards, having entered service in 2011, but its tour will soon come to an end.
AMG says the smaller new V8 is capable of producing even more power than the 5.5 V8 - although, for now, its highest production output is listed at 375kW.
Crucially, the 4.0 litre V8 is expected to produce those bigger numbers while keeping fuel consumption and carbon emissions lower than can be achieved with the 5.5 litre engine.
We haven’t seen the end of the 5.5 V8 just yet, though. In 2015, the engine will power the new GLE 63 Coupe, while models currently powered by the M157 will continue to do so for a while to come.
But, with updates and replacements scheduled for the years ahead, we can likely expect the 5.5 to take up retirement near the end of the decade.