The M270 and M274 are turbocharged inline-four engines produced by Mercedes-Benz since 2011. They are the successor to the previous M266 and M271 engines respectively. The engine appeared on the Ward's 10 Best Engines list for 2017.
Design M270 refers to the transverse configuration for front-wheel drive vehicles, while M274 refers to the longitudinally-mounted layout for rear-wheel drive vehicles. Both engines are based on the same design with dual overhead camshafts, 4 valves per cylinder, variable valve timing, direct injection, and compliance with the EU6 emissions standard. A engine was introduced in September 2012 featuring an increased piston stroke up to , increased performance figures, and a 9.8:1 compression ratio. The M274 engine was also used on the Infiniti Q50 since 2014.
M270 engine EngineDisplacementPowerTorqueYearsM270 DE16 LA R at 4,500–6,000 rpm at 1,200–3,500 rpm2015– at 5,000 rpm at 1,250–4,000 rpm2011–M270 DE16 LA at 5,000 rpm at 1,250–4,000 rpmM270 DE20 LA at 5,000 rpm at 1,250–4,000 rpm2013– at 5,000 rpm at 1,250–4,000 rpm at 5,500 rpm at 1,200–4,000 rpm2012– at 5,500 rpm at 1,200–4,000 rpm2015–
M270 DE16 LA R 75 kW version 2015–2018 A 160 (W176) 2015–2018 B 160 (W246)
90 kW version 2011–2018 B 180 (W246) 2012–2018 A 180 (W176) 2013–2019 CLA 180 (C117) 2015–2019 GLA 180 (X156)
M270 DE16 LA 2011–2018 B 200 (W246) 2012–2018 A 200 (W176) 2013–2019 CLA 200 (C117) 2014–2019 GLA 200 (X156)
M270 DE20 LA 115 kW version 2013–2018 B 200 Natural Gas Drive (W246)
135 kW version 2013–2018 B 220 4MATIC (W246) 2014–2018 A 220 4MATIC (W176) 2016–2018 CLA 220 4MATIC (C117)
155 kW version 2012–2018 A 250 (W176) 2012–2018 B 250 (W246) 2013–2019 CLA 250 (C117) 2013–2019 GLA 250 (X156) 2015–2019 Infiniti Q30 2016–2019 Infiniti QX30
160 kW version 2015–2018 A 250 Sport (W176) 2015–2019 CLA 250 Sport (C117)
M274 engine EngineDisplacementPowerTorqueYearsM274 DE16 LA D274.910 at 5,000 rpm at 1,200–4,000 rpm2015– at 5,300 rpm at 1,250–4,000 rpm2012–M274 DE20 LA D274.920 at 5,000 rpm at 1,250–4,000 rpm2013– at 5,500 rpm at 1,200–4,000 rpm at 5,500 rpm at 1,200–4,000 rpm at 5,500 rpm at 1,300–4,000 rpm2015– at 5,800 – 6,100 rpm2019–
M274 DE16 LA 95 kW version 2015–2019 C 160 (W205)
115 kW version 2012–2013 C 180 (W204) 2014–2019 C 180 (W205) 2013–2016 E 180 (W212) 2016–2020 E 180 (W213) 2015–2020 SLC 180 (R172)
M274 DE20 LA 115 kW version 2013–2016 E 200 Natural Gas Drive (W212)
135 kW version 2013–2016 E 200 (W212) 2013–2016 GLK 200 (X204) 2014–2018 C 200 (W205) 2015–2020 SLC 200 (R172) 2016-2020 E 200 (W213) 2019-2023 Sprinter (W907)
155 kW version 2013–2016 E 250 (W212) 2013–2016 GLK 250 (X204) 2016–2019 GLC 250 4MATIC (X253) 2014–2018 C 250 (W205) 2015–2018 C 350e (W205) 2018–2021 C 300e (W205) 2015–2019 V37 Q50/Nissan Skyline (2014-2019; 200GT-t DBA-ZV37/DBA-YV37) 2016–2018 E 250 (W213) 2016–2018 E 350e (W213) 2018–2023 E 300e (W213) 2015–2019 GLC 350e 4MATIC (X253) 2019–2022 GLC 300e 4MATIC (X253) 2016–present V 250 (W447) (Chinese market) 2016-2023 Metris (W447) 2016–present CV37 Q60 2015–2019 Y51 Q70China model only
180 kW version 2015–2018 C 300 (W205) 2015–2018 E 300 (W213) 2015–2019 SLC 300 (R172) 2015–2019 GLC 300 / GLC 300 4MATIC (X253)
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