Cleanest turbo diesel emissions profile in Mercedes-Benz history. Wayne Gerdes – CleanMPG – May 31, 2016 The 195 hp 2.2L TD in the new E-Class. Mercedes-Benz is the first manufacturer to place a completely new family of turbo diesel engines on the market that can meet the strictest EU emission limits set to be enacted in September of 2017. The new emissions targets were met with new stepped combustion chambers and even more advanced exhaust-gas recirculation (EGR). The new design sees all EGR components mounted directly on the engine enhancing the system’s overall effectiveness. The market launch of the completely newly developed 195 hp (+25 hp over the current 2.1L) I4 turbo diesel engine named OM 654 will be in the new E-Class. The E 220d is rated at 60 mpgUS combined on the NEDC or about 40 mpgUS on our own EPA. Maybe? The new I4 is the first member of a modular engine family that will be applied across the entire Mercedes-Benz Car and Van lineup. Longitudinal and transverse installation in vehicles with front-, rear- and all-wheel drive has also been designed in. Mercedes=Benz stated that until widespread market success of BEVs, high-tech combustion engines will remain the backbone of individual European mobility. And why they are investing as much as $3.3 billion USD to ensure further decreases in fuel consumption and emissions for current and future vehicles. On-Road Low Emissions Conformation The new family of turbo diesel engines were designed to emit low NOx no matter the drive cycles they are experiencing. The lab and on-road emissions results has been confirmed by independent measurements by DEKRA, a German vehicle inspection company. DEKRA carried out an extensive test program with a Mercedes-Benz E 220 d. The focus was on Real Driving Emissions (RDE), the method prescribed in the EU as of September 2017 in addition to measuring emissions on the test bench. The RDE dynamic test program covers various stretches of road that include urban streets, country roads and freeways. The measurements were carried out at various temperatures between about 35 and 60 degrees F with various masses and varying loads. The E 220 d emitted less NOx than 80 mg/km limit on all applicable RDE routes. In some cases, the NOx emissions were at the very low level of between just 13 and 21 mg/km even at low ambient temperatures. Continuous Improvement Mercedes-Benz engineers made use of the new family of diesel engine designs to improve the emissions of current vehicle models. That includes optimizations with regard to turbocharging and further fuel injection and intercooling optimizations, as well as the application of new materials such as chromized timing chains. The combination of these measures results in improved robustness of the parts and components that are subjected to particular stress by combustion and EGR. The operating range of EGR has been extended towards significantly lower temperatures. Another factor is the increased efficiency of the SCR systems. This has been achieved by modifying the design of the exhaust system and by applying new catalyst materials. This entire package of measures is now being applied into current turbo diesel engine production. Gasoline engines with particulate filters? We have known for a while that particulate emissions spikes from modern direct injected gasoline engines can occur during startup in particular. Mercedes-Benz is going to reduce those particulate emissions with the first large-scale use of particulate filters for gasoline engines. After more than two years of field tests with the Mercedes-Benz S 500, additional versions of the S-Class with gasoline engines will soon be equipped with particulate filters during the next model upgrade. That will be followed by gradual implementation in further new gas engine equipped models. The big news is of course the all-new I4 turbo diesels. They are scheduled for North America in the C and E-Class … All I got from Mercedes-Benz PR is, “Sometime in the future.” Let us hope sooner rather than later.