On this page we will try to help you fix a issue that can be irritating, and if not managed in time become a financial drain. In reality, spotting a leak on your vehicle is rarely reassuring, and it is even less reassuring when it’s a gearbox leak on your BMW 4 Series . Today, we’re going to help you verify that it’s in actual fact a gearbox leak, then, how to remedy a gearbox or transmission leak, then, give you some prevention suggestions, and, finally, give you an idea of the price of the gearbox of a BMW 4 Series.

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Gearbox leak on BMW 4 Series, source and manifestation

If you have noticed an oil stain on the ground, you will need to validate that this leak is in actual fact caused by the gearbox of your BMW 4 Series. To achieve this, you will need to go under your car and follow the oil leak. If it is transmission oil, it must be caused by your gearbox sump or an adjacent room. Once affirmed, here are the possible roots of this transmission leak:

  • A gearbox cap: If it’s improperly screwed on…
  • Defective torque converter: Only equipped on automatic gearboxes.
  • From the transmission oil sump: In the event that it is cracked or damaged
  • One of your seals damaged

How to repair a gearbox leak on BMW 4 Series?

After discovering the different roots of a gearbox or transmission oil leak on your BMW 4 Series, we will try to explain to you what are your options to remedy this oil leak. Take note that no matter the reason, after having identified a leak, you must go to a mechanic to identify the exact source of the leak, in any other case your gearbox might be irreparably damaged. Nevertheless, here is how the service of the mechanic and the solutions that will be offered to you:

  • Very often to identify the leak, the mechanic will have to take apart your gearbox, which will require a high labour cost.
  • If you’re lucky and it’s just a gasket, your mechanic will replace it and reassemble the gearbox of your BMW 4 Series, in any other case you’ll have to replace the complete gearbox
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  • At last, for the do-it-yourselfers, it is possible to use a sealing kit which is only effective in the case of small leaks, this kit is worth around 40 euros

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Prevention: How to avoid gearbox leaks on your BMW 4 Series?

There aren’t many solutions to avoid gearbox leaks on your BMW 4 Series , nevertheless here are the three most effective:

  • Frequent oil changes on your gearbox deck.
  • Drain your gearbox and put new oil in it. If you want to know everything about this task, please read our content on this subject matter.
  • Use a particular additive for routine service of gearbox seals, these additives will restore flexibility and enable to plug moderate leaks, you will discover some for a few dozen euros at Oscaro.

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Price of a BMW 4 Series gearbox

At last, we would like to give you an idea of how much it costs to replace the gearbox of a BMW 4 Series. As you have realized, gearbox problems often lead to a complete replace of this part. It is hard to give you a precise price because based on the mechanic the labour can vary a lot and based on your engine the part will also have a different price, nevertheless, we estimate that the repair, labour included will cost you between 800 and 2000 euros , knowing that the part alone costs between 400 and 1000 euros.

If you want more guides on the BMW 4 Series, go to our BMW 4 Series category.