BMW X5 M50i Engine Replacement - Rebuilt & Reconditioned Units from £5,700

BMW X5 M50i Engines for Sale | Engine Finders

Engine Finders connects UK drivers with trusted suppliers for reliable BMW X5 M50i replacement engines, addressing common N63B44T3 issues such as excessive oil consumption and thermal stress failures.

BMW X5 M50i Replacement Engines

The X5 M50i (G05, 2019-present) is powered by the N63B44T3 4.4-litre V8 twin-turbo petrol engine. Over the years, BMW has refined this engine with improved thermal management, updated VANOS calibration, and upgraded turbocharger cooling. However, failures remain common, particularly with valve stem seals, timing chain wear, and injector malfunctions. BMW Service Bulletin SI B11 04 19 highlights recurring overheating concerns specific to the N63B44T3 in the X5 M50i, often linked to coolant line weaknesses. Owners of earlier builds (2019-2021) frequently report turbo oil leaks, while later updates addressed these with revised gaskets. Our replacement engines are specifically reconditioned for these generation-specific vulnerabilities to ensure reliability.

BMW X5 M50i Models & Engines Codes

The X5 M50i exclusively uses high-performance petrol V8 engines. Each code carries known issues unique to this model:

• N63B44T3: 4.4L twin-turbo petrol, used from 2019-present in the G05 X5 M50i. Known for valve stem seal degradation and turbo oil line leaks, addressed with updated OEM gaskets.
• N63TU3: Internal designation for technical updates in 2020. Enhanced cooling passages and timing chain tensioner (OEM 11318685181), but still prone to carbon build-up under UK stop-start driving.
• S63B44A (special tuning in some M Performance test units): Less common, but shares injector failure patterns when retrofitted in certain X5 M50i prototypes.

Unlike the 40i variants, the M50i’s N63B44T3 is tuned for higher torque delivery (750Nm) which accelerates timing chain wear in urban driving conditions. Our reconditioned engines account for this by reinforcing critical wear components.

Buy Used and Second-Hand BMW X5 M50i Engines

Buyers of the X5 M50i can choose from used, reconditioned, rebuilt, and remanufactured engines. Each type offers different advantages depending on budget and reliability expectations.

• Used Engines: Direct take-outs, lower cost but may retain N63B44T3 thermal issues.
• Reconditioned Engines: Inspected and fitted with upgraded timing chains and seals.
• Rebuilt Engines: Worn N63 components replaced with OEM parts such as injectors (13538648937).
• Remanufactured Engines: Factory-standard rebuilds with BMW-approved updates for long-term reliability.

For the X5 M50i, we recommend remanufactured units as they best address chronic thermal management weaknesses in the N63B44T3.

BMW X5 M50i Engines in Stock

Our stock of X5 M50i reconditioned engines includes critical updates designed to prevent repeat failures common to this model.

• Upgraded timing chain tensioner (OEM 11318685181) to prevent premature stretch.
• New valve stem seals to resolve excessive oil consumption.
• Revised turbo oil lines and gaskets to prevent leakage.
• High-pressure fuel injectors replaced (OEM 13538648937).

Each engine undergoes hot and cold bench testing with oil pressure diagnostics tailored to the N63B44T3 before delivery.

Warranty for Replacement BMW X5 M50i Engines

All rebuilt and reconditioned X5 M50i engines supplied through Engine Finders include a 12-month parts warranty, offering peace of mind against major faults.

• Standard 12-month coverage for block and head assemblies.
• Specific exclusions for known design limitations in N63 timing chain systems.
• Option to extend coverage when fitted by approved UK BMW specialists.

Engine Finders is a comparison service connecting buyers with vetted UK suppliers. Warranty terms may vary by supplier and are subject to individual conditions.