BMW 750i (G11) engine: which one, problems and replacement

The BMW 750i in the sixth 7 Series generation (G11, built 2015–2022) was built with 2 different engines over its life: the N63B44T2 (450 hp, 2012–2018) and the N63B44T3 (462 hp, 2016–2026).

This guide tells you which engine your 750i has, what goes wrong with it, what a replacement costs from our stock and what else to plan for when you fit one.

• Generation: sixth 7 Series, 2015–2022
• Body styles: G11 (saloon)
• Engines: N63B44T2, N63B44T3
• Output: 450 hp and 462 hp
• Replacement engines in stock: 9 from 5.115,00 €

Which engine is in your 750i?

N63B44T2 in the 750i

The N63B44T2 was used in the G11 750i, built 2012–2018. It is a 4.4 L twin-turbo petrol V8 with 450 hp and 650 Nm. Compared with the N63B44T3 (462 hp), it is the mildest.

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.

N63B44T3 in the 750i

The N63B44T3 was used in the G11 750i, built 2016–2026. It is a 4.4 L twin-turbo petrol V8 with 462 hp and 650 Nm. Compared with the N63B44T2 (450 hp), it is the strongest.

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; T3 identifies the version or output stage.

750i engines by model year

The engine changed 2 times during the G11 run, in 2016 and 2019. Changes usually come with BMW's mid-life update (LCI) or a new emissions standard, so a car registered early in a year can still have the older engine. The VIN settles it.

Other cars with the same engine as the 750i

A replacement engine does not have to come from another 750i. 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 F15 X5 50i.

N63B44T3: BMW G30 550i, BMW G05 X5 50i, BMW G07 X7 50i.

How to confirm your engine code

Because the 750i 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 750i engine problems

The N63B44T2 and N63B44T3 in the 750i 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 750i

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 750i 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 750i: checklist

1. 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.
2. Sump, oil pickup and drive variants. Rear-drive, xDrive and front-drive cars can use different sumps, oil pickups and engine mounts even with the same engine code. Check that the sump matches your subframe and front axle.
3. 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.
4. 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.
5. List of what is fitted. Engines are sold with different ancillaries: some have the turbo, injectors, manifolds, alternator and starter, others are long blocks. Agree the list in writing so you know which parts must come from your old engine.
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 750i replacement engine cost

Across 9 750i engine units in our stock today, prices start at 5.115,00 € and reach 8.866,00 €. The median — the price in the middle of the range — is 8.163,00 €.

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.

2 of these come from G11 donor cars, priced from 8.160,00 € to 8.866,00 €. 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 750i

Here is a selection of 750i engines currently on our shelves, photographed in the yard. Click any of them for the full photographs, mileage and specification.

BMW F15 X5 50i N63B44T2 Engine, Premium Grade8.151,00 €BMW G11 750i N63B44T2 Engine, Premium Grade8.160,00 €BMW G11 750i N63B44T3 Engine, Premium Grade8.866,00 €BMW G05 X5 50i N63B44T3 Engine, Premium Grade8.857,00 €

BMW F15 X5 50i N63B44T2 Engine, Premium Grade — 8.151,00 €, reduced from 8.720,00 €. It comes from a recorded donor car, and 16 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW G11 750i N63B44T2 Engine, Premium Grade — 8.160,00 €, reduced from 8.720,00 €. It comes from a recorded donor car, and 10 units are available. We can confirm fitment against your VIN the same day.

BMW G11 750i N63B44T3 Engine, Premium Grade — 8.866,00 €, reduced from 9.360,00 €. It comes from a recorded donor car, and 25 units are available. We can confirm fitment against your VIN the same day.

BMW G05 X5 50i N63B44T3 Engine, Premium Grade — 8.857,00 €, reduced from 9.360,00 €. It comes from a recorded donor car, and 9 units are available. We can confirm fitment against your VIN the same day.

Will it fit my 750i?

Will the N63B44T2 fit my BMW G11 750i?

The N63B44T2 is the original engine for the BMW G11 750i, which makes it the straightforward choice. The sixth 7 Series was built 2015–2022, 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 G11 750i?

We have 1 N63B44T2 engine from G11 donor cars, priced from 8.160,00 €. 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 750i

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.

750i engine questions

Will the N63B44T3 engine fit my BMW G11 750i?

Yes, if your BMW G11 750i was built with the N63B44T3. BMW used this 4.4 liter (4,395 cc) petrol engine with 390 kW (530 HP) in the G11 750i from about 2018 to 2026.

In our records the N63B44T3 is the engine for the G11 750i, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your G11 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.

Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all N63 Engines · Search N63B44T3 in the shop

Will the N63B44T3 engine fit my BMW G11 750i?

Yes, if your BMW G11 750i was built with the N63B44T3. BMW used this 4.4 liter (4,395 cc) petrol engine with 390 kW (530 HP) in the G11 750i from about 2018 to 2026.

In our records the N63B44T3 is the engine for the G11 750i, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your G11 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.

Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all N63 Engines · Search N63B44T3 in the shop

Will the N63B44T3 engine fit my BMW G30 M550i?

Yes, if your BMW G30 M550i was built with the N63B44T3. BMW used this 4.4 liter (4,395 cc) petrol engine with 390 kW (530 HP) in the G30 M550i from about 2018 to 2026.

Some G30 M550i cars were built with a different engine: the B58B30M1. These look alike from the outside, so check the code on your engine or send us your VIN.

Also tell us if your G30 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.

Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all N63 Engines · Search N63B44T3 in the shop

How much is a replacement N63B44T3 engine for a BMW G05 X5 M50i?

A used N63B44T3 for the BMW G05 X5 M50i costs from about 5.000 € to 7.700 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.

Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.

A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The N63B44T3 you buy is photographed and checked in Hamburg before it is listed.

Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all N63 Engines · Search N63B44T3 in the shop

How do I know a used N63B44T3 engine is in good shape?

Before a unit is listed, the yard checks the engine code against the listing, writes down the parts fitted to it, seals every opening and photographs the real engine you will receive. An inspection certificate for the unit can travel with the order when you ask for it.

When you look at a listing, check the recorded mileage, the year and the photos of the ports and the stamp. Ask for photos of anything you want to see closer. You can ask for extra photos, a close-up of the code stamp or a short video before you order.

On a petrol engine like the N63B44T3, a careful fitter will also look at the spark plugs, the coils and the timing side before the engine goes in.

If the engine fails inside under normal use, the warranty covers you. Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop.

See all N63 Engines · Search N63B44T3 in the shop

Delivery, warranty and payment

Every 750i engine we sell is drained, sealed at each opening, strapped to a heat-treated pallet and shrink-wrapped before it leaves Hamburg. You receive photographs of the packed engine and a tracking number.

Door-to-door delivery is included to the address you give at checkout. Typical delivery takes three to five working days within Germany and neighbouring countries and five to ten working days to the rest of Europe and the UK.

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.

All G11 engines · N63 engine guide · BMW 750i engines for sale · Send us your VIN