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How Long Does Synthetic Oil Last? All You Need to Know

How often do you generally change your oil? In this article, I’ll discuss the longevity of synthetic oil and its benefits over conventional oil. Let’s first understand: how long does synthetic oil last in any vehicle?

Synthetic oil can typically last for about 6 months to 1 year. One should replace the synthetic oil after approx. 7000-10000 miles of coverage. The actual lasting of synthetic oil depends on several factors, including the brand of oil, the vehicle’s age, and the driving conditions.

If you are confused about changing your synthetic oil, you can go for the services manual. The manufacturers recommend in the manual all the real-life queries in their guide where the working capacity with specific oils and their timespan are mentioned. You can take helpful tips from those discussions to determine the longevity of synthetic oils.

How Long Does Synthetic Oil Last?

The lifespan of synthetic oil depends on several factors, including the oil’s quality, the engine’s operating conditions, and the manufacturer’s recommended oil change interval. In general, synthetic oil can last longer than conventional oil.

Most synthetic oil manufacturers claim that their products can last up to 7,000 to 10,000 miles or one year, whichever comes first. However, this can vary greatly depending on the specific type of synthetic oil, the vehicle it's being used in, and driving conditions. 

Therefore, following the manufacturer’s recommendations and regularly checking the oil’s condition with oil change intervals and oil analysis is essential.

It’s also worth noting that while synthetic oil can last longer than conventional oil, it’s still necessary to change the oil periodically to keep the engine functioning smoothly and to prevent the buildup of contaminants that can harm the engine.

The following table shows several synthetic oil brands and their claimed lifespan:


Claimed Lifespan

Mobil 1

Up to 15,000 miles or one year

Royal Purple

Up to 25,000 miles or one year


Up to 25,000 miles or one year

Castrol Edge

Up to 15,000 miles or one year

Valvoline SynPower

Up to 15,000 miles or one year

Pennzoil Ultra Platinum

Up to 15,000 miles or one year

Different Factors that can Affect the Lifespan of Synthetic Oil:

There are few factors that can affect the lifespan of synthetic oil:

  1. The viscosity index of oil
  2. Engine type
  3. Accumulated mileage
  4. The pattern of driving driving
  5. Condition of riding
  6. Oil life monitors
  7. Care of vehicle
How Long Does Synthetic Oil Last

1. Viscosity Index:

Synthetic oils are thermally stable oil which is an irrefutable fact about them compared to mineral-based oils. Synthetic oils are better and have a better viscosity index with a resistance level to break down under scorching temperatures.

These oils have additives that can reduce and slow down the viscosity loss of the fluid by improving its wear protection.

2. Engine Type:

The same level of longevity is not guaranteed in the case of all synthetic oils. Different results are seen using synthetic oils on gas and diesel-fed engines. Diesel fuel is a less refined product and produces acid and soot as its by-product.

The same results are seen in the case of a turbocharged engine in which the spinning stops after the turning off situation of engines. More heat is produced, and super-charged engines reduce their spins and require time to back up longer.

3. Accumulated Mileage:

In most cases, two vehicles can hold the same engine that can be either gas-based or diesel. Many miles of power plants have a more significant amount of unburnt fuel in their belt area.

A person observes more frequent oil changes due to the production of contaminants mixed with the synthetics. It leads to faster deterioration of the quality of the oil.

Oil changing frequency works in a reverse manner, and a person can classify their wheeler as it depends on the foreseeing nature of the car in the future. Shorter oil change intervals are recommended if you use your vehicle more often.

4. The Pattern of Driving:

The style of driving and behavior associated with driving depends on the person’s lifestyle and according to the geographical location.

The vehicles used by farmers are more prone to severe service than everyday driving. Less roughed engines are seen in crowded cities as people face non-stop traffic.

The manufacturers’ recommendations for oil change intervals are dependent on the driving conditions. The shorter interval trips reduce the quality of helpful oil and demand the shortchanging intervals.

5. Condition of Riding:

A large amount of dirt can occupy the space in the air filters of the engine and vehicle, even if they are of high quality. These contaminants can pass through the vehicle and mix with the oil present in an engine.

It leads to the degradation of accelerated oil. Premature oxidation and corrosion of the engine are seen in hot weather. It is due to the excess moisture state and metal wear that can affect the usable life of the oil.

6. Oil Life Monitors:

The oil life monitor is an engine oil replacement mechanism advancement. Most cars and automobiles are equipped with oil life monitors known as the intelligent oil-life monitor system, as seen in Ford and Lincoln vehicles.

These oil life monitors are high-tech systems that can track the person’s driving habits and check the mileage and start and end time of ignition. It also helps determine the right time for oil replacement of the engine.

Various factors are associated with the oil life monitors for calculating the oil change at intervals. These factors include the engine, temperature conditions, vehicle speed, and other operating parameters. The accurate reading is detected when more variables are taken into account.

Experts and manufacturers suggest that a person change the synthetic oil once a year. This thing can be considered as, at last, the oil life monitors are computer-generated results that only estimate the changing oil condition.

The availability of contaminants and other malfunctions related to the engine can lead to an inaccurate form of readings.

7. Care of Vehicle:

Most vehicle owners believe in placing their cars in their garages during icy weather conditions. They believe that their vehicle will stay good in such weather. 

If you are also such a person, it is recommended to take some precautionary measures and change the oil before placing it in the garage for a longer duration. It will increase the oil’s longevity and make sure that your vehicle is storing contaminant-free oil in its engine.

Oil filters should also be kept into consideration in this matter. They are known to show association with the harmful stuff that can make the oil old inside the engine. A poor-quality oil filter can damage the engine’s lubrication system and will not let the synthetic oil work at its own pace.

Real-World Examples of Synthetic Oil:

Below are a few real-world examples to help understand the use of synthetic oil:

1. Automotive Industry: 

Synthetic oil is commonly used in high-performance and luxury vehicles due to its superior performance. It provides better protection against engine wear and tear, reduces friction, and operates more efficiently in extreme temperatures.

For example, Porsche recommends using synthetic oil in all of its vehicles, and many high-end car manufacturers specify the use of synthetic oil in their owner’s manuals.

2. Aerospace Industry: 

Synthetic oils are used in aircraft engines due to their stability and resistance to breakdown under high temperatures and pressure.

The U.S. military has used synthetic oils in its aircraft for decades, and many commercial airlines have also switched to synthetic oils for their superior performance.

3. Industrial Applications: 

Synthetic oils are used in various industrial applications, such as turbines, compressors, and hydraulic systems.

They provide improved performance and longer lifespan compared to conventional mineral oils, which can help reduce maintenance costs and increase productivity.

4. Racing: 

Synthetic oils are frequently used in racing engines because they can withstand high levels of stress and provide superior protection against engine wear.

Many professional racing teams use synthetic oils to gain an advantage over their competitors.

5. Wind Turbines: 

Synthetic oils are used in wind turbines to lubricate gears and provide protection against corrosion. In addition, they have a longer lifespan than mineral oils and provide better performance in harsh environments, making them an ideal choice for wind turbine applications.

These are just a few examples of how synthetic oil is used in different industries and applications. Synthetic oil is an essential component of many industries and helps support a wide range of critical operations by providing better performance, protection, and efficiency.

Benefits of Using Synthetic Oil:

The higher cost of synthetic oil is disturbing for various car owners, but its advantages mask all the costs. Synthetic oil has numerous advantages that are not available in the case of conventional oils. Some of the benefits are:



Long duration of an oil change

Synthetic oil can last more than 15000 miles in any vehicle. After covering this range of miles, it becomes necessary to change the oil because of the presence of refined properties in any vehicle. 

Higher temperature

Synthetic oils don’t become thick as compared to conventional oil. Heat does not make it a thick viscous fluid so it lasts better even at higher temperatures.


Synthetic oils can last longer and run cleaner due to their refined quality. It makes them the best quality and an ideal oil for better performance either used in lightweight vehicles or in hauling heavy loads.

Measuring the Oil in the Vehicle:

Various queries are asked about the tires and engines in the case of automobiles and ATV vehicles. The experienced vehicle owners concerned for their vehicles are also interested in determining the longevity of the oil used for running the engine.

Previously, the 3000-miles oil changing rule was followed for all vehicles, and in that case, synthetic oil was not used. But now, synthetic oil has reduced the properties of friction and dirt and has improved the engine's performance. 

The benefits of synthetic oils have made them last longer than usual compared to conventional ones. It is good news for the frugal car owners in the market.

The auto-makers of the vehicles like Mercedes-Benz and Jaguar have modified the design of their vehicles. They have stretched their longevity to up to 15000 miles. These figures of longevity are associated with their ideal conditions and are implemented differently according to the nature of the vehicle.

Synthetic and Conventional Oil:

Synthetic oil is considered an expensive option than conventional oil. This is because synthetic oil is present in a highly refined state and can last longer than usual. The high-quality nature of synthetic oil helps the engine perform better, which is why it is used in vehicles that perform well.

The better performance of an engine does not mean that synthetic oil always works better for all vehicles. Although it provides various benefits regarding engine working, conventional oil is still used as the best option for vehicles. You can check the user’s manual to detect the best kind of oil for your vehicle.

Final Thought:

Synthetic oil can be an excellent choice for a vehicle, as it can provide superior protection and performance compared to conventional oil.

However, it is essential to note that synthetic oil’s longevity depends on various factors, including the type of vehicle, driving conditions, and the type of synthetic oil used. Ultimately, following the manufacturer’s recommended oil change intervals is essential to ensure that your vehicle runs at its best.

Also Read:

Lunchbox Locker: Everything You Need to Know
Are Rough Country Lift Kits Good? What You Need to Know

Frequently Asked Questions (FAQs):

How often should a person change the synthetic oil?

A person can change the synthetic oil after every 7500-15000 miles of distance. It depends on the brand of the synthetic oil and vehicle. You should also check the owner’s manual before changing the oil at proper intervals.

Can a person travel more than 10000 miles using synthetic oil?

A person can travel more than 10000 miles with fully synthetic oils. Synthetic oils also possess a specific lifespan but can still work up to 15000 miles or more than this range.

How many miles on average can a person travel using synthetic oil?

You can change the intervals between the oil changes and extend them using synthetic oil. You can travel between the range of 5000-7500 miles on average, and these intervals can be longer or shorter.

Can a synthetic oil last longer than a year?

The synthetic oil rating is between six months to a year, and the recommended ratings are for everyday driving. This rating does not affect the severe driving conditions that require frequent oil changes.

Can a person tell whether synthetic oil is required to change or not?

 The common signs that indicate the changing in oil are:

  • The different signs shown by the car
  • You can forget the exact time when you last changed the oil
  • The dark and grainy color of the oil
  • A noisy engine
  • Smoking of a tailpipe

Can you change the oil after every two years?

Manufacturers recommend that a person change the oil in an engine every 10-15000 km or even after a year. It is the regular usage of the vehicle, and you can also change it after two years of usage frequently.

Is it difficult to switch back to regular oil after using synthetic oil?

It is easy to switch back to regular oil after using synthetic oil. These are the myths that a person cannot use regular oil. You can also use a blend of synthetic and conventional oils.

Is it a good idea to change the oil frequently?

It is not a good idea to change the oil frequently as it requires a lot of time, money, and resources from you. Changing the oil frequently leads you to throw away the oil that is still in a usable form.

What are some of the disadvantages associated with the usage of synthetic oil?

The glaring disadvantage of synthetic oil is its cost of two to four times more than conventional oil. Other than this, synthetic oils are more prone to precipitation during cold storage conditions.

Should a person change their oil after every six months?

Some old standards associated with the changing of oil are now updated. A general recommendation is that a person changes their oil after every 5000 miles of coverage or exact after six months.

Does a synthetic oil last for a year?

Yes, synthetic oils can last for six months to a year and cover up to 10000-15000 miles.

If you don’t drive too much, how often should a person change the synthetic oil?

A person can change the synthetic oil in typically six months to a year. It is not an excellent initiative to extend the oil changing duration even in case of short trips.

Which engine oils are best for the vehicles?

 Some of the best engine oils are:

  • Castrol GTX is an overall runner-up engine oil
  • Pennzoil Ultra Platinum synthetic oil
  • Amsoil series synthetic oil is the best runner-up oil