N55 vs B58
Side-by-side reliability comparison
Higher reliability score
B58
BEST
93/100
+17 points over N55
0
/ 100
ACCEPTABLE
N55
BMW
0
/ 100
BEST
B58
BMW
Specifications
N55
B58
Brand
BMW
BMW
Verdict
ACCEPTABLE
BEST
Reliability
76
93
Years
2009--2016
2015--present
Displacement
2979 cc
2998 cc
Layout
I6
I6
Type
Petrol Turbo
Petrol Turbo
Power
306--326 hp
326--387 hp
Known Issues
5
3
Total Risk Cost
€1,050--€2,300
€430--€1,000
Character
N55
"Fixed N54. Known issues cheap + documented. 200k+ km proven. Good tuning base."
B58
"Possibly BMWs best engine ever. Forged internals, insane tuning (600hp+). 300k+ km."
Issues Comparison
N55 5
▲ HIGH
Electric water pump failure
● MODERATE
Valve cover gasket oil leak
● MODERATE
Oil filter housing gasket (OFHG) leak
● MODERATE
Plastic charge pipe crack
○ MINOR
Coolant pipe / banjo bolt seals
B58 3
● MODERATE
Coolant expansion tank / line failure — early units
○ MINOR
Plastic charge pipe crack
○ MINOR
Valve cover gasket oil leak