BMW B58 engine report, M140i F20 LCI
BMW B58 · 1 Series (F20)
3.0 LPetrolInline-62016–2019
87/100
Checked by hand
[excellent]
Excellent engine, priced for a bad day
Worth buying if the service history checks out.
ExcellentGoodSolidRiskyAvoid
- Known issues
- 12
- Critical
- 4
- Sources
- 98
Verdict
Oil pump wear and sludge buildup is the one to take seriously: critical, very common, and the reason this engine is not a straight yes.
Ask for full service records and have the pump inspected before you commit, not after. Budget for a water pump as well, since that is common enough to expect at higher mileage. The high-pressure fuel pump and the injectors show up occasionally and add real cost when they do. Rod bearings, head gaskets, ringlands and the gearbox are all rare or very rare, so a well-priced car with clean history should not be walked away from over them.
Specs
- Displacement
- 3.0 L2,998 cc
- Layout
- Inline-6
- Fuel
- Petrol
- Compression
- 10.2:1 - 11.0:1
- Production
- 2015–present
- Chassis
- F20
- Generation
- LCI
- Fitted
- 2016–2019
Known issues
12 confirmed · sorted by severity
CriticalOil pump wear / sludge buildup
Oil pump wear or sludge accumulation (often from extended oil-change intervals) reducing oil pressure and lubrication.
Symptoms
- Warning Light
- Knocking Noise
How often
Very common · Owner-caused. Can destroy the engine if ignored. Not safely drivable.
CriticalPiston ringland failure
Piston ringland cracking under high cylinder pressure/heat, common on tuned forced-induction engines.
Symptoms
- Power Loss
- Smoke (White/Blue/Black)
- Misfire
How often
Rare · Design weakness. Can destroy the engine if ignored. Not safely drivable.
CriticalRod bearing failure
Connecting rod (big end) bearing wear or spun bearing, usually from oil starvation or extended oil-change intervals -- can destroy the engine if not caught early.
Symptoms
- Knocking Noise
- Warning Light
How often
Very rare · Owner-caused. Can destroy the engine if ignored. Not safely drivable.
CriticalHead gasket failure
Head gasket failure, often preceded by overheating; can lead to a warped head or cracked block if not addressed.
Symptoms
- Coolant Loss
- Smoke (White/Blue/Black)
- Warning Light
How often
Very rare · Age-related wear. Does not normally destroy the engine. Not safely drivable.
Evidence
1 owner report backs this, confidence 40/100.
HighHigh-pressure fuel pump failure
HPFP wear or failure, sometimes shedding metal debris into the fuel system.
Symptoms
- Misfire
- Warning Light
- Hesitation
How often
Occasional · Age-related wear. Does not normally destroy the engine. Not safely drivable.
Evidence
15 owner reports back this, confidence 45/100.
ModerateWater pump failure
Water pump seal or bearing failure (mechanical or electric pump), causing coolant loss.
Symptoms
- Coolant Loss
- Warning Light
How often
Common · Age-related wear. Does not normally destroy the engine. Still drivable.
Evidence
29 owner reports back this, confidence 50/100.
ModerateDual-mass flywheel / clutch wear
Dual-mass flywheel wear causing rattle/vibration, often coinciding with clutch replacement interval.
Symptoms
- Excessive Vibration
- Knocking Noise
How often
Very rare · Expected maintenance. Does not normally destroy the engine. Still drivable.
LowFuel injector failure
Injector wear, sticking, or seal failure causing misfires, rough running, or fuel leaks.
Symptoms
- Misfire
- Rough Idle
- Fuel Smell
How often
Occasional · Age-related wear. Can destroy the engine if ignored. Still drivable.
Evidence
18 owner reports back this, confidence 55/100.
LowVariable valve timing solenoid/actuator failure
VANOS/VTEC/VVT-style variable valve timing solenoids or actuators fail or clog, causing rough idle, rattle on start, or reduced power.
Symptoms
- Rough Idle
- Reduced Power Mode
- Warning Light
How often
Occasional · Age-related wear. Can destroy the engine if ignored. Still drivable.
LowOil leak from seals or gaskets
Valve cover gasket, rear main seal, or front main seal degradation causing external oil leaks.
Symptoms
- Oil Consumption
How often
Occasional · Age-related wear. Does not normally destroy the engine. Still drivable.
Evidence
11 owner reports back this, confidence 45/100.
LowWastegate / boost actuator failure
Wastegate, boost control actuator, or diverter/blow-off valve failure causing boost leaks or inconsistent boost pressure.
Symptoms
- Reduced Power Mode
- Turbo Lag
How often
Occasional · Age-related wear. Does not normally destroy the engine. Still drivable.
LowIntercooler failure or leak
Intercooler core cracking or pipe seal failure, causing boost loss.
Symptoms
- Power Loss
How often
Very rare · Age-related wear. Does not normally destroy the engine. Still drivable.
- Critical
- High
- Moderate
- Low
Oil pump wear / sludge buildupfrom 85k km
High-pressure fuel pump failurefrom 161k km
Water pump failurefrom 128k km
Fuel injector failurefrom 74k km
Variable valve timing solenoid/actuator failurefrom 129k km
Oil leak from seals or gasketsfrom 126k km
Check the car you're looking at
Set the mileage of the car you're looking at. Problems owners say start before it are the ones to ask the seller about; the next ones are what to budget for.
km
2 already past · 3 coming up
Already past: ask for proof
Owners say these start before this mileage. Nothing tells us whether this car had them fixed, so ask, and ask for the invoice.
The next 30k km
Further on High-pressure fuel pump failure
No reliable mileage Piston ringland failure, Rod bearing failure, Head gasket failure, Wastegate / boost actuator failure, Dual-mass flywheel / clutch wear, Intercooler failure or leak
Too few owners said at what mileage these start, so they are not placed above.
Buying checklist
BMW B58 (M140i F20 LCI) · Buying checklist
Sources
Updated 15 Sept 2026 · scoring v2.7
Behind this report sit 98 owner posts, forum threads and official records. Nothing gets on the list on one person's word. It takes a recall, or owners on separate platforms describing the same fault. The score then sets how often a problem turns up against the damage it does.