M266 vs M104

Side-by-side reliability comparison

Higher reliability score
M104 BEST 85/100
+23 points over M266
0 / 100
CAUTION M266 Mercedes-Benz
0 / 100
BEST M104 Mercedes-Benz

Specifications

M266
M104
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
CAUTION
BEST
Reliability
62
85
Years
2005--2011
1990--1997
Displacement
2034 cc
3199 cc
Layout
I4
I6
Type
Petrol Na
Petrol Na
Power
116--193 hp
193--231 hp
Known Issues
1
1
Total Risk Cost
€800--€2,000
€500--€2,000

Character

M266

"W245 B-Class. Inclined engine (at 57°). Unusual design. Balance shaft chain can break. Oil leaks. CVT gearbox issues (not engine). Turbo version (B200T) more troublesome."

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

M266 1

▲ HIGH
Balance shaft chain failure €800--€2,000 80,000 km--150,000 km

M104 1

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

Models

M266 2

A-Class W169 2004--2012 A-Class W169 2005--2012

M104 0

No models listed.

Full M266 Report Full M104 Report