The most impressive innovation found in the 2019 Mercedes-Benz CLS 53 AMG is the new, electrified 3.0-litre engine that offers twin-turbocharging by way of a traditional exhaust gas turbocharger and the new electric auxiliary compressor. This provide almost instantaneous boost, as when the CLS 53 is starting at zero, the electric auxiliary compressor can immediately build up a high-pressure charge, delivering a faster increase in torque for acceleration until the large conventional exhaust gas turbocharger is deployed. As a result, the CLS 53 is able to zip around, with a glorious turbo lag-free response. It is as if this car gets all the benefits of both a supercharger and a turbo for all our lead foot needs. The new 3.0 L. engine provides the CLS 53 with 429 hp and a maximum torque of 384 lb-ft. The electrified EQ Boost starter-alternator briefly provides an additional 21 hp, plus 184 lb-ft of torque while still feeding the new 48 V on-board electrical system. This impressive new system clearly works as the CLS 53 4MATIC+ rockets from zero to 100 km/h in just 4.5 seconds.

The newly available 48 V on-board electrical system is also available to provide the CLS 53 with more robust traditional functions like; shifting, gliding and restarting of the engine by the start/stop function.