S55 vs M57
Side-by-side reliability comparison
Higher reliability score
M57
BUY
84/100
+19 points over S55
0
/ 100
CAUTION
S55
BMW
0
/ 100
BUY
M57
BMW
Specifications
S55
M57
Brand
BMW
BMW
Verdict
CAUTION
BUY
Reliability
65
84
Years
2014--2018
1998--2012
Displacement
2979 cc
2993 cc
Layout
I6
I6
Type
Petrol Turbo
Diesel
Power
431--450 hp
184--286 hp
Known Issues
3
0
Total Risk Cost
€2,800--€7,000
€0--€0
Character
S55
"Track weapon. M-car level care mandatory. Fragile if abused."
M57
"Legendary diesel six. Powered E46 330d to E90 335d. Smooth, torquey, reliable. Swirl flaps and turbo actuator at high mileage."
Issues Comparison
S55 3
◆ CRITICAL
Crankshaft hub failure — pre-2016 production
◆ CRITICAL
Rod bearing wear — M-car maintenance required
● MODERATE
Turbo oil seal wear
M57 0
No documented issues.