OM651 (late) vs M104

Side-by-side reliability comparison

Higher reliability score
M104 BEST 85/100
+13 points over OM651 (late)
0 / 100
ACCEPTABLE OM651 (late) Mercedes-Benz
0 / 100
BEST M104 Mercedes-Benz

Specifications

OM651 (late)
M104
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
ACCEPTABLE
BEST
Reliability
72
85
Years
2014--2020
1990--1997
Displacement
2143 cc
3199 cc
Layout
I4
I6
Type
Diesel
Petrol Na
Power
136--204 hp
193--231 hp
Known Issues
2
1
Total Risk Cost
€800--€2,200
€500--€2,000

Character

OM651 (late)

"Post-2014: updated injectors + pump. Much improved. Highway excellent."

M104

"W124/R129/W140 inline-6. One of Mercedes' most reliable engines. Bulletproof bottom end. Wiring harness biodegrades (uses soy-based insulation). Head gasket solid. 400k+ km possible."

Issues Comparison

OM651 (late) 2

▲ HIGH
DPF blockage — city driving concern €500--€1,500 60,000 km--120,000 km
● MODERATE
EGR valve fouling (post-2014) €300--€700 80,000 km--150,000 km

M104 1

▲ HIGH
Wiring harness biodegradation €500--€2,000 100,000 km--200,000 km

Models

OM651 (late) 10

A 180d W176 2014--2018 Hatchback B 180d W246 2014--2018 MPV C 200d W205 2014--2018 Sedan C 220d W205 2014--2018 Sedan C 220d Wagon S205 2014--2021 Wagon E 200d W212 2009--2016 Sedan E 220d W212 2009--2016 Sedan GLA 200d X156 2013--2020 SUV GLC 220d X253 2015--2022 SUV GLC 250d Coupe C253 2016--2019 SUV

M104 0

No models listed.

Full OM651 (late) Report Full M104 Report