B38 vs B58
Side-by-side reliability comparison
Higher reliability score
B58
BEST
93/100
+21 points over B38
0
/ 100
ACCEPTABLE
B38
BMW
0
/ 100
BEST
B58
BMW
Specifications
B38
B58
Brand
BMW
BMW
Verdict
ACCEPTABLE
BEST
Reliability
72
93
Years
2014--present
2015--present
Displacement
1499 cc
2998 cc
Layout
I3
I6
Type
Petrol Turbo
Petrol Turbo
Power
109--136 hp
326--387 hp
Known Issues
3
3
Total Risk Cost
€850--€1,900
€430--€1,000
Character
B38
"Budget modern BMW. Reliable but not exciting. 136hp adequate for city. Limited tuning."
B58
"Possibly BMWs best engine ever. Forged internals, insane tuning (600hp+). 300k+ km."
Issues Comparison
B38 3
● MODERATE
Timing chain wear (rare — oil dependent)
○ MINOR
Intake valve carbon buildup (DI)
○ MINOR
Wastegate rattle (cold start)
B58 3
● MODERATE
Coolant expansion tank / line failure — early units
○ MINOR
Plastic charge pipe crack
○ MINOR
Valve cover gasket oil leak