Mercedes-Benz E-Class 300d 4MATIC diesel AWD automatic

2023
50%

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9.3 10 Clean Air Index
4.0 10 Energy Efficiency Index
1.9 10 Greenhouse Gas Index
Laboratory Tests NMHC NOX NH3 CO PN
9.310 Cold Test
9.610 Warm Test
8.810 Highway
Cold Ambient Test Does not qualify for additional robustness testing
Road Test
9.810 On-Road Drive
4.55 On-Road Short Trip
On-Road Heavy Load Does not qualify for additional robustness testing
On-Road Light Load Does not qualify for additional robustness testing
Congestion Does not qualify for additional robustness testing
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  • n.a.
  • good
  • adequate
  • marginal
  • weak
  • poor

Comments

Pollutant control in the diesel E-Class is exceptional and demonstrates some results never seen before. The vehicle collects almost all points in every test and keeps emissions at a minimum level even in the Highway Test, where many competitors struggle. NOx emissions – typically a challenge for diesel powertrains – are practically non-existent, and only in the Short Trip are there some after a cold engine start. Another astonishing achievement lies in the particle control, as the test results come close to, or are even below, Green NCAP's very stringent lower thresholds.

Laboratory Tests Energy
4.510 Cold Test
5.210 Warm Test
2.410 Highway
Cold Ambient Test Does not qualify for additional robustness testing
Consumption Driving Range
Average 6.3l100 km 1,064km
Worst-Case 7.5l100 km 884km
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  • n.a.
  • good
  • adequate
  • marginal
  • weak
  • poor

Comments

The E300d requires less than six litres of diesel fuel for 100 km in the standard Cold and Warm Lab Tests, as well as in the On-road Drive. These figures are even below the officially declared WLTP value of 6.5 l/100 km. The Short Urban Trip is measured to consume slightly more than 7 l/100 km, whereas performing the dynamic Highway cycle needs 7.5 l/100 km. The values are creditable for a vehicle of this type, power and mass.

Greenhouse Gases CO2 N2O CH4
2.510 Cold Test
3.410 Warm Test
0.010 Highway
Cold Ambient Test Does not qualify for additional robustness testing
Download detailed test results
  • n.a.
  • good
  • adequate
  • marginal
  • weak
  • poor

Comments

This is the most challenging category for the E300d. Good methane (CH4) emissions control earns the car the maximum bonus points, but – typically for diesel powertrains – the car emits N2O above Green NCAP's threshold and the E300d loses 1.5 test points. CO2 is around 145‑155 g/km at the tailpipe in both WLTC+ Lab Tests and rises to 194 g/km during the more challenging Highway Test. The addition of the emissions related to diesel production and supply (ca. 30 g CO2‑eq./km) reduces further the Mercedes's score in this part of the assessment.

Our verdict

The Mercedes-Benz E300d tested here is a station wagon with a two‑litre diesel engine, providing 210 kW peak power and 550 Nm of torque. The empty weight of the luxurious vehicle is 2,077 kg. The car takes every advantage of the efficiency of its diesel powertrain, which is supported by a 48 V mild-hybrid system. Consumption values below 6 l/100 km are realistic. Nevertheless, the consumption figures are not low enough to help the Mercedes get more than 1.9 points in the Greenhouse Gas Index. The truly astonishing achievement of Mercedes' engineers is visible in the Clean Air Index: with 9.3 points out of 10, the diesel E-Class becomes the cleanest combustion-engined vehicle Green NCAP has tested so far. The E-Class maintains control over the pollutants in all tests, while minimising both NOx and particle number to extreme levels.
Overall, the E300d earns an Average Score of 50% and 3 Green Stars.

Specifications

  • Tested Car W1K2132191B02XXXX
  • Publication Date 09 2023
  • Vehicle Class Executive Car
  • Emissions Class Euro 6d AP
  • Tyres 245/35 275/30R20
  • Mass 2,077 kg
  • Engine Size 1,993 cc
  • Power/Torque 210 kW/550 Nm
  • Declared CO2 170 g/km
  • Declared Consumption 6.5 l/100 km
  • Heating Concept Waste heat