Mercedes-Benz OM656 engine

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.

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–present 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


 * 2023-present W223 S 450 d 4MATIC