BMW F26 X4 buying guide: the first X4 explained
The F26 X4 brought the SUV coupé idea to the mid-size class. This guide covers its engines, the X4 M40i, xDrive, practicality, common issues and what to check before you buy.
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The F26 X4 was launched in 2014 as a sportier, coupé-styled version of the F25 X3. It took the idea first seen on the X6 and brought it to a smaller and more affordable car.
The F26 X4 shares engines, xDrive and much of its technology with the X3, so many of the same checks apply. This buying guide explains the engines, versions, common issues and what to look for before buying one.
An X3 with a coupé roof
The X4 sits lower than the X3, with a sloping roofline, a lower seating position and a sportier suspension setting. It was built in Spartanburg, USA, alongside the X3, X5 and X6.
Because the X4 is based on the F25 X3, our F25 X3 buying guide explains many of the shared parts. The X4 has less rear headroom and a smaller boot, but it offers a more distinctive look and a slightly sportier drive.
Engines
The F26 X4 was offered with several engines:
- xDrive20i and xDrive28i: four-cylinder turbo petrols, the N20 in most cars.
- xDrive35i: the N55 six-cylinder turbo petrol.
- X4 M40i: a more powerful version of the six-cylinder turbo petrol with sports suspension.
- xDrive20d: a four-cylinder diesel, the most common version in Europe.
- xDrive30d and xDrive35d: strong six-cylinder diesels. Our article on the BMW N57 diesel explains them.
All F26 X4 models have xDrive all-wheel drive and most have the eight-speed automatic gearbox.
The X4 M40i
The X4 M40i was one of the first M Performance SUVs. It has a high-output six-cylinder turbo petrol, a sport exhaust, revised suspension and sharper steering. It is fast and engaging for an SUV.
When buying an M40i, look for a full service history, even tyre wear and no warning lights. Our article on N54 vs N55 vs B58 explains the BMW six-cylinder turbo engines.
F26 X4 common issues
Points to check include:
- N20 petrol timing chain guides on earlier cars. Our article on BMW timing chain problems explains the symptoms.
- Four-cylinder diesel timing chain on early xDrive20d models, before the switch to the B47 engine. Our article on the BMW B47 engine explains the newer unit.
- Oil leaks from the valve cover and oil filter housing gasket.
- Electric water pump and thermostat on petrol models.
- Transfer case and xDrive: check for clunks on full lock.
- DPF and EGR on diesel cars used mainly for short trips.
- Front suspension bushes on a heavy car. Our article on BMW suspension bushings explains them.
xDrive and tyres
xDrive sends torque between the axles through a clutch in the transfer case. Mismatched tyres can strain the system, so check that all four tyres are the same brand, size and similar wear. Many X4s were sold with run-flat tyres, which can make the ride firmer. Our article on BMW run-flat tyres explains the options.
Practicality
The F26 X4 has a usable boot and folding rear seats. Rear headroom is lower than in the X3, so taller passengers may find it tight. The tailgate is electric on many cars. For most couples and small families, the X4 is practical enough for daily life and holidays.
If you regularly carry adults in the rear or need the largest possible boot, the X3 is the more practical choice.
Running costs
The xDrive20d is the most economical, while the six-cylinder diesels combine strong performance with reasonable fuel consumption. The petrol six-cylinders and the M40i use more fuel.
Servicing is condition based, and costs are similar to the X3. Budget for tyres, brakes and suspension parts on a heavy car, and for possible repairs on high-mileage diesel models. Many cars have large wheels, which raise tyre costs.
Test drive checklist
On the test drive:
- Start the engine cold and listen for rattles.
- Turn on full lock slowly to check for xDrive clunks.
- Check that the gearbox shifts smoothly in all modes.
- Feel for vibration under braking.
- Test the electric tailgate and all comfort functions.
- Read the fault memory.
Our complete checklist for buying a used BMW M car covers many checks that apply to any BMW.
F26 X4: points to remember
Look for a car with complete service history, fresh gearbox and transfer case fluid on higher-mileage cars, and matching tyres. Check whether software updates and recalls have been completed. A specialist inspection can identify timing chain noise, oil leaks and suspension wear before you buy.
Is the F26 X4 a good buy?
A good F26 X4 is a stylish, practical and enjoyable SUV. The xDrive30d is a strong all-round choice, while the M40i is the enthusiast option. Four-cylinder models are economical but need careful checks of their timing chain history.
Buy on condition and history rather than price, and the X4 can be a rewarding car to own.
BMW F26 X4 key facts
| Item | Details |
|---|---|
| Production | 2014 to 2018 |
| Body | SUV coupé |
| Built in | Spartanburg, USA |
| Related model | F25 X3 |
| Petrol | xDrive20i, xDrive28i, xDrive35i, M40i |
| Diesel | xDrive20d, xDrive30d, xDrive35d |
| Key checks | Timing chain, leaks, xDrive, tyres |
Frequently asked questions
Is the F26 X4 based on the X3?
Yes, it is based on the F25 X3 and shares its engines and xDrive system.
Which F26 X4 engine is best?
The xDrive30d is a strong all-round choice, while the M40i is the most exciting.
Is the X4 practical?
It has a usable boot, but less rear headroom and space than the X3.
Do all F26 X4 models have xDrive?
Yes, all F26 X4 models have xDrive all-wheel drive.
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