Engines Market

BMW M550i SPECIALISTS

BMW 5 Series M550i Engine Replacement Compare Prices & Get Quotes

Looking for a BMW 5 Series M550i engine replacement- Get quotes today from trusted UK BMW M550i engine specialists and compare prices on reconditioned, rebuilt and used engines for your G30 M550i xDrive.

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BMW 5 Series M550i Engine
from£4,500 to £8,500...
  • Usedfrom £2,500
  • Reconditionedfrom £4,500
  • Common codesN63B44O2, N63B44T3, N63B44D
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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

BMW 5 Series M550i Engine History & Specs at a Glance

The BMW M550i xDrive was introduced in 2017 as the flagship M Performance model of the G30 5 Series range, sitting just below the full-fat M5. Powered by BMW's N63 4.4-litre twin-turbo V8, the M550i brought M Division-inspired performance to the executive saloon segment, offering a compelling balance of luxury, everyday usability and explosive power.

BMW 5 Series M550i
  1. 2017

    G30 M550i xDrive launched with N63B44O2 4.4L V8, producing 456hp (340kW) and 650Nm of torque

  2. 2020

    M550i receives the updated N63B44T3 V8 from the M850i, boosting output to 523hp (390kW) and 750Nm

  3. 2021

    Further power increase to 530hp with N63B44D variant

  4. 2023

    G30 M550i production ends; V8 engine retired from non-M 5 Series models

Every engine fitted to the BMW 5 Series M550i is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

BMW 5 Series M550i Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

N63B44O2 — 4.4L Petrol V8 Twin-Turbo (G30: 2017-2019) engine

N63B44O2 — 4.4L Petrol V8 Twin-Turbo (G30: 2017-2019)

Power Output
456hp (340kW)
Years Fitted
2017-2019

Can’t find your exact engine code?-> Get quotes for N63B44O2 BMW 5 Series M550i engine replacement

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Common Problems

BMW 5 Series M550i Engine Problems Repair Cost vs Replacement

The BMW M550i's N63 V8 is a masterpiece of engineering, delivering effortless performance. However, the 'hot-vee' design - with turbos mounted between the cylinder banks - generates extreme heat that can accelerate wear on gaskets, seals and timing components. Later N63TU3 and N63B44D variants are notably more reliable. A rebuilt M550i engine through EnginesMarket includes upgraded components addressing the original failure points, plus a minimum 12-month unlimited-mileage warranty.

Common failure points and repair options

Excessive Oil Consumption

Affected
BMW 5 Series M550i (N63B44O2, N63B44T3, N63B44D)
Typical failure mileage
40k-80k
Root cause
Valve stem seals degrade prematurely due to heat from the hot-vee turbo layout. Many owners report adding a quart of oil every 700-1,000 miles.

Repair options

Repair tierDealer priceSpecialist price
Valve stem seal replacement£2,500-£4,500£1,500-£2,800
Full Replacement - rebuilt/reconditioned engine£7,000-£12,000£4,500-£8,500
Our recommendation
Valve stem seal replacement is a well-documented fix for N63 oil consumption. If caught early, this is a cost-effective specialist repair. If the engine has suffered from prolonged oil starvation or other failures, a rebuilt unit with warranty is the safer long-term choice.
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Timing Chain Stretch and Guide Wear

Affected
BMW 5 Series M550i (N63B44O2, earlier N63 variants)
Typical failure mileage
60k-100k
Root cause
Plastic timing chain guides become brittle with heat cycling, leading to chain stretch and potential catastrophic failure.

Repair options

Repair tierDealer priceSpecialist price
Timing chain and guide replacement£2,000-£4,000£1,200-£2,500
Full Replacement - rebuilt/reconditioned engine£7,000-£12,000£4,500-£8,500
Our recommendation
If you hear rattling on cold startup, have the timing chain guides inspected immediately. Preventative replacement is strongly recommended on N63 engines approaching 80,000 miles. If the chain has already jumped, a rebuilt engine is typically the most cost-effective route.

Cooling System and Turbo Oil Feed Line Failures

Affected
BMW 5 Series M550i (all N63 variants)
Typical failure mileage
50k-90k
Root cause
Extreme under-hood heat from the hot-vee design causes plastic cooling system components to degrade, and turbo oil feed line o-rings to fail.

Repair options

Repair tierDealer priceSpecialist price
Cooling system refresh + oil line replacement£1,000-£2,000£600-£1,200
Full Replacement - rebuilt/reconditioned engine£7,000-£12,000£4,500-£8,500
Our recommendation
Regular cooling system inspection and replacement of turbo oil feed line o-rings are essential on all N63 V8s. These are relatively inexpensive fixes that prevent catastrophic failure. If the engine has overheated badly, a rebuilt unit with warranty is the safer long-term choice.

Don't Let Engine Failure Write Off Your BMW 5 Series M550i

The M550i represents the pinnacle of BMW's M Performance V8 engineering. With regular preventative maintenance - particularly oil consumption monitoring, timing chain inspection and cooling system attention - your M550i can keep delivering that signature twin-turbo V8 character for years to come. If replacement is required, EnginesMarket connects you with UK specialists offering rebuilt N63 units with 12-month warranty and nationwide delivery.

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FAQ

BMW 5 Series M550i Engine ReplacementFrequently Asked Questions

Everything BMW 5 Series M550i owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare BMW 5 Series M550i Engine Prices Today

Comparing quotes for your BMW 5 Series M550i engine replacement is free, no-obligation, and specific to your exact generation and N63 engine code - whether that's the early 456hp N63B44O2, the 523hp N63B44T3 from the M850i, or the final 530hp N63B44D. Enter your registration above to receive tailored quotes from UK specialists who understand the unique challenges of the hot-vee V8.

N63B44O2,N63B44O2, N63B44T3 & N63B44D engines supplied through our network
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