BMW X5 50i (F15) engine: which one, problems and replacement

The BMW X5 50i in the third X5 generation (F15, built 2013–2018) was built with 2 different engines over its life: the N63B44T2 (450 hp, 2012–2018) and the N63B44O1 (450 hp, 2012–2018).

Below you will find how to identify the engine in your X5 50i, the faults to look for, current prices for a replacement and the swap options that make sense.

• Generation: third X5, 2013–2018
• Body styles: F15 (SAV)
• Engines: N63B44T2, N63B44O1
• Output: 450 hp
• Replacement engines in stock: 17 from 3.224,00 €

Which engine is in your X5 50i?

N63B44T2 in the X5 50i

The N63B44T2 was used in the F15 X5 50i, built 2012–2018. It is a 4.4 L twin-turbo petrol V8 with 450 hp and 650 Nm. It has the same output as the N63B44O1, so the build date decides which one your car has.

Reading the code: N marks an N-series code, the generation of BMW engines introduced from 2001; 63 is the family number; B stands for petrol (from the German Benzin); 44 is the capacity in decilitres, so 4.4 litres; T2 identifies the version or output stage.

N63B44O1 in the X5 50i

The N63B44O1 was used in the F15 X5 50i, built 2012–2018. It is a 4.4 L turbocharged petrol V8 with 450 hp and 650 Nm. It has the same output as the N63B44T2, so the build date decides which one your car has.

Reading the code: N marks an N-series code, the generation of BMW engines introduced from 2001; 63 is the family number; B stands for petrol (from the German Benzin); 44 is the capacity in decilitres, so 4.4 litres; O1 identifies the version or output stage.

X5 50i engines by model year

The X5 50i kept the same engine for the whole F15 run, which makes ordering simple: any unit with the same code fits, subject to the gearbox, drive type and sump.

Other cars with the same engine as the X5 50i

A replacement engine does not have to come from another X5 50i. These models left the factory with the same engine code, so a unit from any of them is a candidate donor once the sump, mounts and ancillaries are matched to your car.

N63B44T2: BMW F10 550i, BMW G11 750i.

N63B44O1: BMW F10 550i, BMW F01 750i.

How to confirm your engine code

Because the X5 50i used more than one engine, the badge alone does not tell you which one your car has. The build date is the first clue; the VIN is the proof. Send us the last seven characters of the VIN and we read the engine code from BMW's records, or look for the code stamped on the block. How to find your BMW engine code.

Known X5 50i engine problems

The N63B44T2 and N63B44O1 in the X5 50i share the known weak points of the N63 family. Full N63 guide.

Oil consumption from valve stem seals. Early engines burn oil because heat inside the V hardens the valve stem seals. BMW issued a customer care programme for this.

Piezo injectors (early N63). Early piezo injectors fail and cause misfires; updated versions are more reliable.

Timing chain stretch. Chains stretch on high-mileage engines, especially with long oil intervals.

Turbo coolant and oil lines. Heat in the V damages coolant and oil lines to the turbochargers.

Crankcase ventilation. The crankcase vent lines and valve cover breathers fail.

Battery drain. The N63 cars need strong batteries because of after-run cooling pumps.

Symptoms to watch for on the X5 50i

Rattle for a few seconds after a cold start. The classic sign of a weak timing chain tensioner or stretched chain. It must be checked quickly: a chain that jumps a tooth can bend valves.

Whistle, loss of boost or limp mode. A split charge pipe, a sticking wastegate or worn turbo bearings. Check the pipes first, then the turbo shaft for play.

Poor low-down torque and uneven idle. VANOS seals or solenoids. The engine may run well at high revs but feel flat and lumpy at low speed.

Long cranking before the engine starts. On direct-injection engines, a weak high-pressure fuel pump or leaking injector lets pressure drop when the engine is off.

Looking after the X5 50i engine

• Oil: 5W-30 BMW Longlife-01, about 8.5 litres with filter.
• Service interval: Oil every 10,000 km at most; BMW's own updates shortened the interval.
• Timing drive: Timing chains at the front, one per bank.
• Workshop notes: Prefer N63TU and later engines where the car allows it. Check the version letter on the engine code (B44A, B44B, B44C, B44D) before ordering.

Buying a used engine for the X5 50i: checklist

1. Ask how the donor car was damaged. Most good used engines come from cars with body damage. A front-end impact can crack sensors, the timing cover or the sump; a rear or side impact usually leaves the engine untouched. The yard records the damage on each unit.
2. Compression or leak-down figures. Even compression across all cylinders tells you more than mileage. Ask for the figures, not just a pass or fail, and compare the highest and lowest readings: a spread above 10 to 15 percent deserves a question.
3. Confirm the exact engine code. Read the code stamped on the block and compare it with the code for your car. Send us the last seven characters of the VIN and we confirm the match before anything is paid.
4. Photographs from every side. Good suppliers photograph the actual engine you will receive. Look for the block stamp, the sump, the timing cover and any broken brackets or connectors in the pictures.
5. Why your old engine failed. Before fitting a replacement, find out why the original failed. An overheating radiator, a blocked intercooler or a failed turbo can destroy a second engine if they are not fixed.
6. Turbocharger shaft play and oil. Rotate the compressor wheel by hand. A small amount of side play is normal; in-and-out play or wheel contact with the housing is not. Oil pooled in the intake or intercooler pipes points to worn seals.
7. Timing chain noise. Listen for a rattle at the front of the engine for the first seconds after a cold start. On an engine that cannot be run, look at the chain guides through the oil filler or with the valve cover off.
8. VANOS operation. Rough idle, a rattle from the front of the head and a loss of torque at low revs point to VANOS seals or solenoids. These are serviceable parts and are easier to renew with the engine out.
9. Double VANOS units and solenoids. Ask for the adaptation values or fault history if the engine was running. Solenoids are inexpensive and are often replaced as a matter of course on a used engine.
10. Injectors and high-pressure fuel pump. Direct-injection engines rely on high-pressure pumps and precise injectors. Ask whether the injectors are original or updated and whether there were fuel pressure faults.
11. Both cylinder banks. On a V engine, check compression, plugs and coils on both banks. Faults on one bank alone are common and easy to miss on a quick test.

BMW X5 50i replacement engine cost

Our X5 50i engine stock runs to 17 units, priced from 3.224,00 € to 8.163,00 € with a median of 5.119,00 €.

Prices depend on the exact version, the donor's mileage, how complete the engine is and the demand for that code. Higher-output versions, low mileage and dressed engines with turbo, injectors and ancillaries cost more; long blocks and higher mileage cost less.

X5 50i engine prices by model year

Engines from 2010–2014 have a median of 5.527,00 €, while units from 2020–2024 sit at 5.635,00 €. Newer engines usually cost more because they come from younger donor cars with lower mileage and later updates.

X5 50i engine prices by mileage

Mileage matters less than history on a well-maintained BMW engine, but it is a useful guide. A low-mileage unit from a younger car gives you more life for a modest premium.

2 of these come from F15 donor cars, priced from 3.290,00 € to 8.151,00 €. An engine from the same body is the most direct swap because the sump, mounts and ancillaries already match.

On top of the engine, budget for the workshop's labour and the parts that are best replaced while the engine is out: engine mounts, the rear main seal, cooling parts, a clutch or converter seal, fluids and filters.

Replacement engines in stock for the X5 50i

Here is a selection of X5 50i engines currently on our shelves, photographed in the yard. Click any of them for the full photographs, mileage and specification.

BMW X6 50i E71 N63B44O1 Engine 2011 · 89,000 km5.527,00 €BMW 550i F10 N63B44O1 Engine 2013 · 40,000 km5.616,00 €BMW F15 X5 50i N63B44O1 Complete Engine3.290,00 €BMW X6 50i F16 N63B44O1 Engine 2019 · 228,000 km5.502,00 €BMW N63B44T2 Engine5.115,00 €BMW N63B44O1 Engine3.229,00 €

BMW X6 50i E71 N63B44O1 Engine 2011 · 89,000 km — 5.527,00 €, reduced from 6.500,00 €. It comes from a 2011 donor car with 89,000 km, and 25 units are available. The listing shows every side of the engine and the fitted parts.

BMW 550i F10 N63B44O1 Engine 2013 · 40,000 km — 5.616,00 €, reduced from 6.500,00 €. It comes from a 2013 donor car with 40,000 km, and 15 units are available. The listing shows every side of the engine and the fitted parts.

BMW F15 X5 50i N63B44O1 Complete Engine — 3.290,00 €, reduced from 3.800,00 €. It comes from a recorded donor car, and 6 units are available. We can confirm fitment against your VIN the same day.

BMW X6 50i F16 N63B44O1 Engine 2019 · 228,000 km — 5.502,00 €, reduced from 6.300,00 €. It comes from a 2019 donor car with 228,000 km, and 10 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW N63B44T2 Engine — 5.115,00 €, reduced from 5.600,00 €. It comes from a recorded donor car, and 7 units are available. The listing shows every side of the engine and the fitted parts.

BMW N63B44O1 Engine — 3.229,00 €, reduced from 3.800,00 €. It comes from a recorded donor car, and 12 units are available. The listing shows every side of the engine and the fitted parts.

Will it fit my X5 50i?

Will the N63B44T2 fit my BMW F15 X5 50i?

The N63B44T2 is the original engine for the BMW F15 X5 50i, which makes it the straightforward choice. The third X5 was built 2013–2018, and the N63B44T2 was produced 2012–2018, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.

How much is a replacement engine for a BMW F15 X5 50i?

We have 1 N63B44T2 engine from F15 donor cars, priced from 8.151,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.

Will the N63B44O1 fit my BMW F15 X5 50i?

The N63B44O1 is the original engine for the BMW F15 X5 50i, which makes it the straightforward choice. The third X5 was built 2013–2018, and the N63B44O1 was produced 2012–2018, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.

How much is a replacement engine for a BMW F15 X5 50i?

We have 1 N63B44O1 engine from F15 donor cars, priced from 3.290,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.

Fitting a replacement engine in the X5 50i

1. Inspect or replace the timing chain parts. Look at the guides and tensioner. On high-mileage engines, replacing them now costs far less than doing it later.
2. Prepare the turbo. Fit new oil feed and return seals, clean the intercooler and pipes of any oil or debris from the old engine, and prime the turbo with oil before starting.
3. Reset VANOS adaptations. Clear the VANOS adaptations so the ECU learns the camshaft positions of the new engine.
4. Fill with the right oil and prime it. Fill with new oil of the correct specification and a new filter. Crank with the fuel and ignition disabled until oil pressure builds.
5. Coding and adaptations. On modern BMWs, the engine ECU must be matched to the car's immobiliser (CAS, FEM or BDC). Reset adaptations, register the battery and clear faults with diagnostic software.
6. First start and leak check. Start the engine, let it idle and watch oil pressure, temperature and fault codes. Check for leaks and bleed the cooling system.
7. First 1,000 km. Drive gently for the first few hundred kilometres, vary the engine speed and avoid full load. Change the oil and filter after about 1,000 km to remove any assembly debris.

The full fitting and first-start procedure.

Delivery, warranty and payment

Before an X5 50i engine leaves our Hamburg yard it is drained of oil and coolant, every opening is sealed, and it is strapped to a pallet and wrapped. We send photographs of the packed unit and the tracking details.

Delivery is door to door and included in the price. Most European addresses receive the engine within five to ten working days; Germany and its neighbours are usually faster.

A 12-month warranty covers eligible internal failure when the engine is fitted by a qualified workshop with new fluids and filters. You can pay by card, bank transfer or crypto and receive the invoice by email straight away.

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