In this quick video, we compare two of Mercedes-Benz’s most iconic diesel engines — the OM646 and OM651.
From horsepower and torque to fuel economy, turbo setup, and transmission options — find out which one is more reliable and efficient in just 60 seconds!

⚙️ Quick Specs (Full Power Variants)

???? OM646 (2002–2010)
2.1L Inline-4 Diesel

OM646 DE22 LA (90 HP / 220 Nm) – A-Class (W169), B-Class (W245)

OM646 DE22 LA (109 HP / 250 Nm) – C200 CDI, E200 CDI, Vito

OM646 DE22 LA (116 HP / 270 Nm) – C-Class (W203), E-Class (W211)

OM646 DE22 LA (136 HP / 315 Nm) – C220 CDI, E220 CDI, Sprinter

OM646 DE22 LA (150 HP / 340 Nm) – E-Class, C-Class Avantgarde

OM646 EVO (170 HP / 400 Nm) – E220 CDI, C220 CDI, Sprinter (late models)

???? Used in: W203, W211, W639 Vito, W906 Sprinter, and early C/E-Class BlueEfficiency models.

???? OM651 (2008–2023)
2.1L Inline-4 Diesel (Single or Twin-Turbo)

OM651 DE22 LA (95 HP / 250 Nm) – A160 CDI, B160 CDI

OM651 DE22 LA (109 HP / 260 Nm) – A180 CDI, C180 CDI, Sprinter

OM651 DE22 LA (136 HP / 330 Nm) – C200 CDI, E200 CDI, GLK200

OM651 DE22 LA (150 HP / 350 Nm) – E200 CDI BlueEFFICIENCY

OM651 DE22 LA (163 HP / 360 Nm) – C220 CDI, E220 CDI, Vito 113 CDI

OM651 DE22 LA (170 HP / 400 Nm) – Sprinter 316 CDI, GLK220 CDI

OM651 DE22 LA (177 HP / 430 Nm) – C250 CDI, E250 CDI

OM651 DE22 LA (204 HP / 500 Nm) – C250 CDI 4MATIC, E250 CDI BlueTEC, GLK250 CDI

???? Used in: W204, W212, W213, W246, W906 Sprinter, X204 GLK, W639/W447 Vito, CLA, GLA, and E-Class BlueTEC models.

???? Oil Spec: 5W30 (MB 229.51 / 229.52)
⚙️ Transmissions:

OM646 → 5G-Tronic, 6-Speed Manual

OM651 → 7G-Tronic, 9G-Tronic (newer models)

???? Used in:
C-Class, E-Class, Sprinter, and Vito models.

???? Verdict:
OM646 → Simpler and more reliable.
OM651 → More powerful and fuel-efficient.

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