N55
BMW · 3.0L Turbo I6
2009–2016
"Fixed N54. Known issues cheap + documented. 200k+ km proven. Good tuning base."
Mileage Risk Timeline
When problems typically appear — enter your mileage to see your risk zone
Known Issues 5
Electric water pump failure
▸Coolant warning light, overheating, no heat from heater
Electric water pump fails predictably at 60-100k km. Replace proactively — failure causes overheating within minutes.
Very common at Greek BMW workshops. Replace at 80k km if not done. Critical in Greek summer.
Valve cover gasket oil leak
▸Oil burning smell, visible oil on top of engine, slight smoke
Very common. Plastic valve cover warps slightly causing gasket failure. Often done with spark plugs.
Standard repair. €200-450. Oil can drip on hot exhaust — do not ignore.
Oil filter housing gasket (OFHG) leak
▸Oil drips under car, oil on underside of engine, burning smell
Very common. Often paired with valve cover gasket replacement.
Greek mechanics know this well. Parts ~€50, labour €200.
Plastic charge pipe crack
▸Loss of boost, whistling, check engine light, reduced power
Plastic charge pipe can crack with age. Aftermarket aluminium replacement available and better.
Inexpensive fix. Aluminium upgrade available in Greece ~€80-120. Worth upgrading proactively.
Coolant pipe / banjo bolt seals
▸Minor coolant weep, coolant smell after engine warm
Small coolant pipes and seals around the engine can weep. Not catastrophic but common at age.
Flag at next service. Cheap parts, modest labour.
Models with N55 14
Other BMW Engines
Tuning Potential
400hp Stage 1 safe
Frequently Asked Questions
Is the BMW N55 reliable?
The BMW N55 scores 76/100 with a verdict of ACCEPTABLE. It has 5 documented issues with total repair costs between €1,050 and €2,300.
What are the common problems with the N55?
The most common issues are:
- Electric water pump failure — high, repair cost €400–€800, 60,000 km–120,000 km
- Valve cover gasket oil leak — moderate, repair cost €200–€450, 60,000 km–130,000 km
- Oil filter housing gasket (OFHG) leak — moderate, repair cost €250–€500, 60,000 km–130,000 km
- Plastic charge pipe crack — moderate, repair cost €100–€300, 60,000 km–150,000 km
- Coolant pipe / banjo bolt seals — minor, repair cost €100–€250, 80,000 km–150,000 km
What cars use the BMW N55?
How much does it cost to repair the N55?
Total potential repair costs for all 5 known issues range from €1,050 to €2,300. The most expensive issue is typically .
What years was the N55 produced?
The BMW N55 was produced from 2009 to 2016. It is a 2979cc I6 petrol turbo engine.
Verdict and scores are editorial opinions based on aggregated data. Learn about our methodology. Not a substitute for professional inspection.