The OM656 is a turbocharged diesel engine produced by Mercedes-Benz since 2017. It was first introduced in the facelift W222 S-Class.
Design The OM656 is based on a modular design that is shared with other 4-cylinder and 6-cylinder, petrol and diesel engines. It is the replacement to the previous V6, in order to maintain the cost of production between different engines. The OM656 has dual overhead camshafts with variable valve timing, and uses AdBlue injection and exhaust gas recirculation to reduce emissions. The cylinder walls are coated with arc sprayed steel whose increased porosity aids oil film strength to reduce friction.
Models EnginePowerTorqueYearsOM656 D29T R SCR at 3,400–4,600 rpm at 1,200–3,200 rpm2017–New six-cylinder diesel engine (OM 656): Majestic long-distance athleteOM656 D29T SCR at 3,600–4,400 rpm at 1,200–3,200 rpmOM656 D30T R M + at 3,400–4,600 rpm at 1,200–3,200 rpm05/2023–OM656 D30T M + at 3,600–4,200 rpm at 1,200–3,200 rpm
OM656 D29T R SCR 2017–2020 W222 S 350 d 2018–2020 C257 CLS 350 d 2018–2020 W213 E 350 d 2018–present W463 G 350 d 2019–present V167 GLE 350 d 2020–present X167 GLS 350 d 2021–present W223 S 350 d
OM656 D29T SCR 2017–2020 W222 S 400 d 2018–2023 C257 CLS 400 d 4MATIC 2018–present W213 E 400 d 4MATIC 2018-present W463 G 400 d 2019–present V167 GLE 400 d 2020–present X167 GLS 400 d 2021–present W223 S 400 d 4MATIC
OM656 D30T R M 2023–present W223 S 350 d (RWD-version and 4MATIC-version) 2023–present X167 GLS 350 d 4MATIC
OM656 D30T M
2023–present X254 GLC 450 d 4MATIC 2023–present C254 GLC 450 d Coupe 4MATIC 2023–present W214 E 450 d 4MATIC 2023–present V167 GLE 450 d 4 MATIC 2023–present C167 GLE 450 d Coupe 4MATIC 2023–present W223 S 450 d 4MATIC 2023–present X167 GLS 450 d 4MATIC 2023–present W465 G 450 d
References
External links OM 656. Most powerful diesel car in Mercedes-Benz history