N63TU (N63B44O1/O2/T3)
BMW · N63TU 4.4 V8 Twin-Turbo (2012-)
2012–present
"The updated hot-V V8 (from 2012-2013) with Valvetronic, forged internals, new valve stem seals and a second coolant pump: 550i F10 from July 2013, 750i, 650i, X5/X6 50i, then M550i, 750i G11, M850i and X5/X7 M50i. Clearly better than the original N63, but it still burns oil (its own US settlement) and chains and injectors are not immune. Budget accordingly."
Mileage Risk Timeline
When problems typically appear — enter your mileage to see your risk zone
Known Issues 5
Oil consumption - valve stem seals (US class-action settlement)
▸Oil top-ups between services, blue smoke after a cold start or on lift-off, oil-level warnings
Despite new valve stem seals, the N63TU1 was the subject of a second US class action (Isley v. BMW, cars built June 2012-May 2019): free oil-consumption tests, engine repair and oil top-offs, still active in 2026. German workshops quote EUR 2,800-3,600 and EUR 3,000-4,500 for new valve stem seals on both heads.
Ask how much oil it uses per 1,000 km. No Greek-specific data found.
Timing chain and tensioner wear
▸Rattle on cold start, cam/crank correlation faults
Less common than on the original N63, but timing-chain issues and premature tensioner wear from heat are still reported on the updated engine. No official campaign and no EUR or km figures found.
Listen to a true cold start before buying. No Greek-specific data found.
Injector failure
▸Misfires, rough idle, check-engine light; can mimic coil or plug faults
Later N63 versions are described as not immune to injector failures, with coking at high mileage. No EUR or km figures found.
Rule out coils and plugs first. No Greek-specific data found.
Brake vacuum pump leak
▸Hard brake pedal, weak brake servo assistance, oil seeping at the pump
A German workshop lists the vacuum pump among the weak points of the N63/N63TU in the 550i and quotes EUR 480-680 including a brake-servo check.
Check the brake pedal feel with the engine running. No Greek-specific data found.
Coolant leaks
▸Falling coolant level, sweet smell after a drive, overheating warnings
Coolant loss is reported on both the original N63 and the later N63TU. No EUR or km figures found.
Check the level often in summer. No Greek-specific data found.
Models with N63TU (N63B44O1/O2/T3) 7
Related Guides
Other BMW Engines
Tuning Potential
500hp+ Stage 1 but reliability suffers
Frequently Asked Questions
Is the BMW N63TU (N63B44O1/O2/T3) reliable?
The BMW N63TU (N63B44O1/O2/T3) scores 62/100 with a verdict of CAUTION. It has 5 documented issues with total repair costs between €3,280 and €5,180.
What are the common problems with the N63TU (N63B44O1/O2/T3)?
The most common issues are:
- Oil consumption - valve stem seals (US class-action settlement) — high, repair cost €2,800–€4,500, N/A–N/A
- Timing chain and tensioner wear — high, repair cost N/A–N/A, N/A–N/A
- Injector failure — moderate, repair cost N/A–N/A, N/A–N/A
- Brake vacuum pump leak — moderate, repair cost €480–€680, N/A–N/A
- Coolant leaks — minor, repair cost N/A–N/A, N/A–N/A
What cars use the BMW N63TU (N63B44O1/O2/T3)?
How much does it cost to repair the N63TU (N63B44O1/O2/T3)?
Total potential repair costs for all 5 known issues range from €3,280 to €5,180. The most expensive issue is typically Oil consumption - valve stem seals (US class-action settlement).
What years was the N63TU (N63B44O1/O2/T3) produced?
The BMW N63TU (N63B44O1/O2/T3) was produced from 2012 to present. It is a 4395cc V8 petrol turbo engine.
Scores are calculated from documented issues, repair costs, and failure patterns across thousands of owner reports and technical sources. Learn about our methodology. Always inspect before you buy.