OM668 vs M104

Side-by-side reliability comparison

Higher reliability score
M104 BEST 85/100
+27 points over OM668
0 / 100
CAUTION OM668 Mercedes-Benz
0 / 100
BEST M104 Mercedes-Benz

Specifications

OM668
M104
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
CAUTION
BEST
Reliability
58
85
Years
1998--2004
1990--1997
Displacement
1689 cc
3199 cc
Layout
I4
I6
Type
Diesel
Petrol Na
Power
75--95 hp
193--231 hp
Known Issues
2
1
Total Risk Cost
€800--€2,000
€500--€2,000

Character

OM668

"W168 A-Class. Same era as M166 petrol. Injector issues. Head gasket concerns. Turbo failure on higher-output version. Not Mercedes' best diesel. Better alternatives exist."

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

OM668 2

▲ HIGH
Head gasket failure €500--€1,200 80,000 km--150,000 km
● MODERATE
Injector failure €300--€800 80,000 km--150,000 km

M104 1

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

Models

OM668 2

A-Class W168 1998--2004 A-Class W168 1998--2004

M104 0

No models listed.

Full OM668 Report Full M104 Report