Why is my motorcycle leaking oil

The presence of oil on the ground where we have parked our motorcycle is a problem that no biker wants to experience. But that presence of oil does not mean that everything is lost, because sometimes it is an easy problem to solve. It’s all a matter of easily identifying it.


You park your motorcycle at night and when you arrive in the morning you find an oil stain under it. Does it sound familiar? If you have been lucky enough that you have not seen yourself in such a situation, the truth is that you still do not know how distressing it can be. But it is also true that this situation does not always have to be related to a costly breakdown, because sometimes it is a problem with an easy solution. To help you calm down, we are going to give you some of the most common reasons why your motorcycle loses oil.

 A poorly closed cap

Among the most stupid problems that can cause your motorcycle to lose oil we find a badly closed cap. Something that may be due to insufficient force when we have closed that cap or due to shocks or vibrations that may have slightly released the cap, causing the loss of oil. It is true that this loss will be small, so it is not one of the most serious problems we can have. In any case, it is worth checking the oil level and refilling it if necessary.

 Excess oil in reservoir

The oil tank of a motorcycle is much smaller than that of a car, so the possibilities of filling it up are considerable. If we exceed the oil capacity of the crankcase, it is possible that it ends up coming out somewhere and generating that leak that worries us so much. Therefore, it is essential that the oil level is always below the maximum line when making the change, removing the possible excess that we have been able to pour into it. Otherwise, we have a good chance of having losses but also more serious failures, due to the corresponding excess pressure.

Delay oil changes

All motor oil has a specific maintenance interval. Depending on its composition, this interval can be 5,000, 7,500, 10,000 or even 15,000 kilometers. These intervals are not optional but it is true that they should not be exceeded much. Spending 100 or 200 kilometers is not a problem, but exceeding more than 5% of the total interval is forcing an oil that will already have little protection capacity.

If the oil is not in good condition it can seep into different areas of the motorcycle and is lost, until it ends up on the ground. By the way, do not forget to change the oil every year, regardless of whether you have not reached the mileage limits that the oil has.

 Using an unsuitable oil

Motor oil has its own characteristics based on its SAE scale, as well as the rest of the standards that it must meet due to its characteristics. These parameters are not accidental, but they have an explanation, depending on the use we give the motorcycle, the terrain through which it moves and the characteristics of its engine.

That is precisely why it is essential that we use a suitable oil in accordance with the instructions given to us by the vehicle manufacturer. An unsuitable oil can not only be the cause of this oil loss, but it will also not have the necessary conditions for the motorcycle to circulate safely. As always, spending on a good motorcycle oil, adapted to what the manufacturer tells us, is always a smart solution.

The oil filter fails

When it comes to lubricating your motorcycle, it is important to have the best motorcycle oil ( here are some options to choose from ) according to what your machine needs. But it is also important to change the oil filters with an adequate frequency, because a filter in bad condition ends up being a problem. If the filter ends up saturated with dirt, it loses all its filtering power and the risk of that filter starting to leak in the area where it is screwed increases.

A problem that can be solved by changing that filter in poor condition for a new one, mounting it correctly and without tightening too much. It is also important that we do not forget to properly grease the base of the new filter, as well as to clean the base of old oil, in order to restore the tightness of the area.


Checking the sleeves

In order for the oil to circulate inside the engine, there are a series of connections, which are responsible for taking it wherever it is needed. These fittings, hoses and sleeves are generally made of plastic material. A material that, with the passage of time, can end up losing its resistance and cause small leaks or oil losses. The good news is that these types of breakdowns are quite easy to find and it is not very expensive to solve them properly either. It is enough to carefully analyze the engine to find that broken or punctured hose, being also easy to replace.

 Cracks and other serious damage

We put aside the minor problems to move on to the biggest problem due to which your motorcycle can lose oil. As with hoses, there are some parts of the engine that can break or crack over time, causing the loss of oil through these leaks. In this case, they are not as easy to replace as a simple sleeve, but it may be necessary to have to change parts or parts of the engine for the loss to stop. Yes, it is true that everything will depend on the caliber of the loss and the affected part, but the most common is that these problems have a more complicated and, above all, more expensive solution.


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