BMW 4 Series gearbox: positioned between the engine and the driven wheels, it transmits power and gives this model its dynamic character. Available as a saloon, coupé and convertible since 2013, the 4 Series has evolved across two generations, up to the 4 Series Gran Coupé II launched in 2021. Like any mechanical component, the transmission can develop faults. This practical guide will help you maintain it, identify problems and choose the right repair solution.
What makes the BMW 4 Series gearbox special
BMW offers the 4 Series with two main engine types: petrol, such as the M440i xDrive 374 hp, and diesel, such as the 430d xDrive 286 hp. On the transmission side, the first generation comes with a six-speed manual gearbox, with an eight-speed automated automatic gearbox available as an option. From the second generation onwards, the eight-speed automatic gearbox is fitted as standard.
Power is delivered either through rear-wheel drive (the two rear wheels are driven) or all-wheel drive (all four wheels are driven). In the latter case, the vehicle is equipped with a transfer case: much like a differential, it distributes power between the front and rear axles. Identifying your configuration is essential to ordering the correct reference from our gearbox catalogue.
Maintaining the BMW 4 Series gearbox
Good habits behind the wheel
Good driving habits extend the life of your transmission. If your 4 Series has a manual gearbox, avoid resting your foot on the clutch pedal and do not skip gears, whether accelerating or changing down. With an automatic gearbox, the golden rule is never to change mode while the vehicle is still moving, as doing so risks damaging the transmission system.
The importance of gearbox oil
Often overlooked, gearbox oil (or transmission fluid) lubricates all the components in the system. Not to be confused with engine oil, it should be changed approximately every 250,000 kilometres on a manual gearbox. Automatic versions require more frequent attention: plan for an oil change every 60,000 kilometres, carried out by your mechanic.
Key warning signs to watch for
Certain symptoms are worth noting down and reporting to your mechanic, as they help reach an accurate diagnosis:
- excessive rumbling or droning inside the cabin;
- a burning smell when engaging reverse;
- unusual noises, even when the vehicle is stationary;
- a general drop in performance, particularly at high speed.
Whatever the cause, consult a mechanic promptly: an untreated fault can cause lasting damage to the vehicle. To understand some of the mechanical causes, read our article why is my gearbox stiff.
Does the gearbox always need replacing?
Good news: a 4 Series gearbox fault does not always mean a full replacement. Only your mechanic, after carrying out a diagnosis, can tell you whether a targeted repair (seals, sensors, clutch) will suffice or whether replacement is necessary. When the transmission is too badly worn, a reconditioned gearbox on an exchange basis — whether an F32-type gearbox or a transfer case — is a lasting alternative to a new part.
Do you drive another model in the range? Also take a look at our advice on the BMW 8 Series gearbox and the BMW 3 Series gearbox.
Frequently asked questions
How often should the gearbox oil be changed on a 4 Series?
Allow approximately 250,000 kilometres for a manual gearbox and 60,000 kilometres for an automatic. These intervals preserve lubrication and limit gear wear.
What is the transfer case on a 4 Series xDrive?
On all-wheel-drive versions, the transfer case distributes engine power between the front and rear axles, in much the same way as a differential.
Is a burning smell in reverse a cause for concern?
It can indicate overheating or a clutch problem. It is advisable to have the transmission checked without delay to avoid more serious damage.
Can I fit an exchange gearbox myself?
Removal and refitting require specialist tools. The best approach is to order the part and then entrust the fitting to your mechanic.
Why choose EDEN BOITES?
EDEN BOITES offers an extensive catalogue of reconditioned gearboxes and transfer cases sold on an exchange basis. Our experts strip, inspect and clean every unit, then replace any defective components. You benefit from a warranty of up to 24 months and a satisfaction-or-money-back guarantee on exchange units, in accordance with our Terms and Conditions. Payment can be spread over several instalments, in up to 10 instalments, and delivery covers France and the European Union, with lead times confirmed on quote. If the model you need is not in our catalogue, we can recondition your existing gearbox. Browse our BMW gearbox range and request your no-obligation online quote.
