How often do I need to change the oil in my car and motorcycle? 

One of the most frequent questions among drivers is how often to change the engine oil in one's car or motorcycle. And it's no wonder: oil is vital for engines to run smoothly. Without proper lubrication, the engine suffers more wear, works at a higher temperature, and loses efficiency.

There is no single right answer for all vehicles, so the first thing you should do is consult your vehicle's owner's manual for the general timeframes you should follow for proper maintenance. In addition, there are factors that should be taken into account and signs that it's time to change the engine oil.

In this guide, we'll explain when to change the oil in cars and motorcycles, why it should not be delayed, and what you need check to for pro-level maintenance.

Why it's a good idea to change engine oil regularly

Oil performs several essential functions within the engine:

• It lubricates internal parts to reduce friction.
• It helps dissipate the heat generated when the engine is running.
• It protects against wear and corrosion.
• It clears debris and impurities to keep the engine cleaner.
• It seals the space between segments and cylinder, preventing the gases generated in combustion from coming into contact with the rest of the engine components.

Over time and kilometers, the lubricant loses properties. This is why putting off an oil change for too long can affect performance and, in the most serious cases, cause costly breakdowns.

Factors that determine after how many kilometers to change the oil

How frequently your engine needs an oil change doesn't just depend on the kilometers you've driven. Other variables that you should keep in mind also have an effect.  

Engine type and technology

Tolerances, working temperature, and the presence of turbocompressor or aftertreatment systems (DPF/GPF) condition the lubricant and the length of service it can offer.

Oil quality: specifications and base

Not all lubricants offer the same durability. Generally speaking, it is advisable to take its origin and classification into account:

• Mineral oil: shorter intervals.
• Semi-synthetic oil: intermediate duration.
• Synthetic oil: greater stability and protection, with normally wider ranges.

Actual vehicle use

Taking long journeys by road is not the same as using your car every day in the city. It is advisable to advance the change if the vehicle circulates frequently in these conditions:

• Heavy urban traffic
• Repeated short journeys
• Constant stops and starts
• Extreme temperatures
• Sport driving
• Towing or high loads

Engine condition

In older engines or that have a lot of mileage, the oil may degrade earlier and require more frequent checking.

Change the engine oil every so many kilometers

If you are looking for a quick answer to after how many kilometers you need to change the oil, then we can offer a brief summary for cars and motorcycles. However, remember that you should always follow what it says in the manufacturer's manual. If the manual for your car or motorcycle demands a different interval that the one recommended here, then that's what you should do.

How often to change a car's oil

If you're wondering how often you need to change your car's oil, the most reliable place to look will always be the manufacturer's manual. Even so, the change is generally needed in many of today's passenger cars between 15,000 and 30,000 kilometers or at least once a year if you don't rack up that much mileage.

In older cars or in vehicles subject to heavy use, it may be advisable to perform maintenance ahead of time.

How often to change a motorcycle's oil

For our two-wheeled friends, the question of how often to change the oil is even more common. The reason is simple: the engine of a motorcycle usually works at higher speeds and, depending on the use, the lubricant may suffer more.

As a general guideline, the a motorcycle's engine oil is usually changed every 3,000 to 10,000 km or, if it hasn't been used much, at least once a year. In fact, in new motorcycles the first inspection is usually done before, which is usually indicated by the manufacturer.

How to know when it's time to change your oil

Beyond the mileage, there are symptoms that may indicate that the oil has lost effectiveness. The most common are:

• The oil indicator light comes on
• The engine sounds rougher or makes strange noises
• The engine works at a higher temperature than usual
• The engine responds less smoothly or if there's less vehicle power
• The oil looks very dark, dirty or milky
• Smell of fuel on the rod or burning after a few kilometers
• The level rises for no reason, which could be the result of dilution

If you notice any of these signs, it's a good idea to check the level and condition of the lubricant as soon as possible.

What happens if I don't change the oil in time?

Changing the oil on time is one of the simplest and most effective ways to extend your engine's life. Delaying maintenance can have important consequences:

• Increased friction between components and internal wear
• Lost performance
• Rising engine temperatures
• Build-up of residue
• Risk of breakdowns of all kinds

 FAQs about oil changes

How often should a car's oil be changed?

Usually every 15,000 to 30,000 kilometers or once a year, although you should always consult the manufacturer's manual.

How often should a motorcycle's oil be changed?

It depends on the model and use, but usually every 3,000 to 10,000 kilometers or once a year, as indicated in the vehicle's manual.

Is it better to change the oil according to the amount of kilometers traveled or go by how much time has passed?

You should pay attention to both. The best thing to do is change the oil according to whichever happens first: the mileage or the time limit.

How often should I change the oil if I don't drive much?

The oil also ages by time: oxidation, moisture (condensation) and additive consumption. Even if you don't drive "enough" to change your oil, you should follow the time limits set by the manufacturer.

Should the filter be changed at the same time as the oil?

Yes. Whenever an engine oil change is made, it is advisable to also change the oil filter, as it retains particles and impurities. If the old filter is left, the new oil can become contaminated sooner and lose effectiveness faster. It is a simple operation that will keep your engine protected.

What happens if I don't change the engine oil?

The lubricant will lose its properties and both engine wear and the risk of breakdowns increases.

Can I refill the oil instead of changing it?

Refilling maintains the level, but does not regenerate the properties of the lubricant, which loses additives and can become contaminated. That is why periodic changes are essential.

Topping off the oil between changes is only correct if the level drops and as long as it is done with a lubricant of the same quality and viscosity.

How to get it right with the right oil

In addition to knowing when to change your car or motorcycle oil, it is essential to choose a lubricant with:

• Recommended viscosity
• Manufacturer's specifications and approvals
• The right quality for the type of engine and use

Using a quality lubricant helps maintain engine protection under different temperature, load, and driving conditions. Remember that you can use the Repsol Lubricants product search engine: enter your license plate or model to get the recommended oil for your car or motorcycle in a matter of seconds.