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The Ultimate Guide to Oil Maintenance for Your 2010 Toyota Prius

Maintaining the oil in your Toyota Prius is crucial for the smooth running of your car. The engine oil not only lubricates but also cools and cleans the engine components, ensuring that it runs efficiently and without damage.

It is essential to understand the importance of oil maintenance and how often it should be changed to keep your 2010 Prius on the road for years to come.

Understanding the Importance of Oil Maintenance in Toyota Prius

Oil maintenance involves checking and changing your car’s oil regularly. At a minimum, you should check the oil level and quality every month and change it every six months or 5,000-10,000 miles, whichever comes first.

A dirty or low oil level can lead to poor fuel economy, decreased engine performance, and possible engine damage, leading to costly repairs. To understand why oil maintenance is critical, let’s look at what happens to the oil in your engine.

As it circulates through the engine, it picks up dirt, dust, and other contaminants. Over time, these impurities can cause the oil to break down, becoming less effective in lubricating and cleaning the engine parts.

Dirty oil can lead to premature engine wear and tear, decreased fuel economy, and increased emissions, making your car less eco-friendly. Oil maintenance helps to keep your engine running smoothly, ensuring that it performs as it should, and prolonging its lifespan.

Regular oil changes can also help to reduce engine noise and ensure that your car stays on the road for many years.

How Often You Should Change the Oil in a 2010 Toyota Prius

The 2010 Toyota Prius comes with a 1.8-liter engine that requires synthetic 0W-20 oil. Toyota recommends changing the oil every 10,000 miles or 12 months, whichever comes first.

However, suppose your driving style is severe or involves frequent short trips. In that case, you may need to change the oil more frequently to ensure that the engine remains in excellent condition.

Severe driving conditions include:

– Frequent short trips (less than 10 miles). – Extreme temperatures (hot or cold).

– Stop-and-go traffic or idling for extended periods. – Heavy loads or towing.

If you drive your Prius in these conditions, you may need to change the oil every 5,000 miles or six months. It is always better to err on the side of caution and change the oil more frequently.

Doing so will help to keep your engine running smoothly and extend its lifespan.


In summary, regular oil maintenance is essential to keep your Toyota Prius running smoothly and efficiently. It is recommended to check your car’s oil level and quality every month and change it every six months or 5,000-10,000 miles, depending on your driving conditions.

Make sure to use the recommended synthetic 0W-20 oil to keep your engine in excellent condition. With proper maintenance, your Toyota Prius will run smoothly and efficiently, providing you with miles of comfortable and eco-friendly driving.

Types of Oil Recommended for a 2010 Toyota Prius

The 2010 Toyota Prius’s engine requires synthetic oil with a viscosity rating of 0W-20. It is essential to use the recommended oil type and viscosity rating for your car to ensure optimum performance.

Synthetic oils are artificially made, and they come with several benefits, including better performance in extreme temperatures, extended oil change intervals, better engine protection, and improved fuel economy. There are different types of synthetic oils available, including fully synthetic and synthetic blend oils.

Fully synthetic oils are made entirely from chemical compounds and provide the highest level of engine protection and performance. They are also more expensive than synthetic blend oils, which are a mixture of synthetic and conventional oils.

Synthetic blend oils provide a decent balance of performance, protection, and cost-effectiveness. When choosing your Prius’s oil, make sure to purchase oil that meets the API SN or SN Plus, ILSAC GF-5, or ACEA A5/B5 specifications.

These specifications ensure that the oil meets the necessary performance and quality standards. You can find these specifications on the oil product label or in the owner’s manual.

How to Check Oil Level in a 2010 Toyota Prius

Checking the oil level in your 2010 Toyota Prius is crucial to ensure that your engine stays healthy and running smoothly. It is recommended to check the oil level every month and before any long trips.

Here are the steps to check your oil level:

Step 1: Park on a level surface. Make sure that your car is parked on a flat surface to ensure accurate oil level measurement.

Step 2: Turn off the engine. Allow your engine several minutes to cool down before checking the oil.

This step ensures that the oil settles in the oil pan for an accurate reading. Step 3: Locate the dipstick.

The oil dipstick is typically located on the engine compartment’s front side, near the front of the engine block. Check the owner’s manual for specific instructions on locating the dipstick.

Step 4: Remove the dipstick. Pull the dipstick out of the engine and wipe it clean with a rag or paper towel.

Step 5: Reinsert the dipstick. Insert the dipstick back into its place and ensure that it goes all the way in.

Step 6: Remove the dipstick again and check oil level. Remove the dipstick from its place, and you should be able to see the oil level on the dipstick.

Typically there will be two marks on the dipstick, one for the minimum oil level and the other for the maximum oil level. Ensure that the oil level is between these two marks.

Step 7: Add oil if necessary. If the oil level is below the minimum mark, you need to add some oil.

Using a funnel, slowly pour the oil into the engine, checking the oil level regularly. It is essential not to overfill the engine with oil as it can damage the engine’s performance.

In conclusion, choosing the correct type of oil and checking the oil level regularly is crucial for maintaining the health of your 2010 Toyota Prius’s engine. Synthetic oils with a viscosity rating of 0W-20 are recommended for your car, and you should ensure that the oil meets the appropriate specification standards.

Checking the oil level is a simple process that can help you prevent potential engine problems. Make sure to check the oil level regularly and add oil when necessary.

The Consequences of Neglecting Oil Maintenance in a Toyota Prius

Neglecting oil maintenance can lead to severe engine problems in your Toyota Prius. It can affect the engine performance, fuel efficiency, and lifespan of your car.

Here are some of the consequences of neglecting oil maintenance:

1. Engine Wear and Tear: Engine oil plays a crucial role in lubricating engine parts, reducing friction and wear and tear.

Neglecting oil maintenance means that the oil becomes dirty, gritty, and less effective at lubricating the engine’s parts. This can lead to accelerated engine wear and tear, resulting in costly repairs or engine replacement.

2. Decreased Fuel Efficiency: Dirty oil causes more friction between the parts in the engine, which can lead to reduced fuel efficiency.

Your car may consume more fuel than necessary to drive the same distance, costing you more money in the long run. 3.

Increased Emissions: Your car’s exhaust system depends on your engine to burn fuel efficiently. Dirty oil can cause your engine to run less efficiently, leading to increased emissions and polluting the environment.

4. Overheating and Engine Failure: Dirty or low oil levels can cause your engine to overheat quickly, potentially leading to engine failure.

An overheated engine can cause significant damages, leading to costly repairs or engine replacement.

How to Determine if Your Toyota Prius Needs an Oil Change

Here are some signs that may indicate your Prius requires an oil change:

1. Dashboard Warning Light: The first indication that your car needs an oil change is a dashboard warning light.

Your Prius has a warning light that lights up when the oil life is low. It’s crucial to take note of these lights and service your car as soon as possible.

2. Unusual Engine Noise: If you hear unusual engine noises such as knocking or ticking sounds, it is a significant indicator that something is wrong with your car.

Neglecting to service your engine or oil change can cause engine noises and damages. 3.

Oil Color and Consistency: When you check your oil level, pay attention to the color and consistency of the oil. Clean oil should be a golden-brown color and smooth in consistency.

Dirty or gritty oil will look dark brown or black and have a rough texture. 4.

Excessive Exhaust Smoke: If you notice thick white smoke coming out of your tailpipe, it could be an indication that your car needs an oil change. Thick white smoke is a sign of a coolant leak or engine problem.

5. Decreased Fuel Efficiency: If you notice that your car loses fuel efficiency and you find yourself filling up the tank more often than usual, it could indicate that your car needs an oil change.

In conclusion, it is vital to keep up with oil maintenance in your Toyota Prius to prevent severe engine problems. Neglecting oil maintenance can lead to decreased fuel efficiency, increased emissions, engine wear and tear, overheating, and engine failure.

Keep an eye out for the signs that indicate your car needs an oil change and always follow the manufacturer’s recommendations for oil change intervals. Regular maintenance can help to ensure the longevity, performance, and fuel economy of your Prius for years to come.

Can You Change the Oil in a 2010 Toyota Prius by Yourself? Changing the oil in a 2010 Toyota Prius may seem daunting, but it is possible to do it yourself with the right tools and knowledge.

Here are the steps to change the oil in your Prius:

1. Prepare Your Car: Park your car on a flat surface and turn off the engine.

Allow the engine to cool down completely. Gather all the tools and materials you need, including a wrench, oil filter wrench, oil pan, and new oil filter.

2. Drain the Old Oil: Locate the oil drain plug under your Prius and remove its plug.

Allow the old oil to drain out into the oil pan. Once the oil has drained completely, wipe the plug clean and replace it.

3. Change the Oil Filter: Locate your Prius’s oil filter and remove it using an oil filter wrench.

Make sure to replace it with a new one, ensuring that you hand-tighten it appropriately. 4.

Refill the Engine with Oil: Open the hood of your car and locate the oil filler cap on the engine’s valve cover. Remove the cap and, using a funnel, add the appropriate amount of new oil into the engine.

Check the oil level using the dipstick to make sure that you have added the correct amount of oil. 5.

Check for Leaks: Once you have replaced the oil filter and refilled the engine with new oil, start the engine and let it run for a few minutes. Check underneath your car for any oil leaks.

Changing the oil by yourself is possible, but it is essential to follow the manufacturer’s recommendations and ensure that you use the appropriate tools and materials.

The Cost of Oil Maintenance for a Toyota Prius

The cost of oil maintenance for a Toyota Prius can vary depending on the type of oil you use, where you get the service, and your geographical location. Here are some factors that can affect the cost of oil maintenance:


Type of Oil: Synthetic oils are more expensive than conventional oils. Using synthetic oil in your Prius can cost you more, but they have extended oil change intervals, which may offset their cost.

2. Service Location: The cost of oil maintenance can vary depending on where you take your car for service.

Dealerships are typically more expensive than independent repair shops. 3.

Labor Costs: Labor costs can vary depending on where you take your car for service. Independent repair shops may offer lower labor costs than dealerships.

4. Geographical Location: The cost of oil maintenance can be affected by your geographical location.

Prices can vary depending on regional differences in the cost of living. On average, the cost of oil maintenance for a Toyota Prius can range from $30 to $90, depending on the factors mentioned above.

It is advisable to compare prices between dealerships and independent repair shops to find the best deal. In conclusion, changing the oil in a 2010 Toyota Prius by yourself is possible with the right tools and knowledge.

The cost of oil maintenance for a Toyota Prius can vary depending on factors such as the type of oil used, service location, labor costs, and geographical location. Always follow the manufacturer’s recommendations and ensure that you use the appropriate oil type and viscosity rating.

Regular oil maintenance is vital for keeping your Prius running smoothly and efficiently, prolonging its lifespan and ensuring that it stays eco-friendly.

How to Make Your Oil Last Longer in a 2010 Toyota Prius

Making your oil last longer in a 2010 Toyota Prius is not only cost-effective but also helps to minimize environmental impact. By adopting proper driving habits and maintenance practices, you can extend the life of your oil and reduce the frequency of oil changes.

Here are some tips to help you make your oil last longer:

1. Drive Smoothly: Avoid excessive acceleration, harsh braking, and abrupt steering maneuvers.

Smooth driving helps to reduce wear and tear on your engine and decreases the need for frequent oil changes. 2.

Warm Up the Engine: Before accelerating aggressively, allow the engine to warm up for a few minutes. This helps to ensure proper circulation of the oil throughout the engine, minimizing friction and maximizing lubrication.

3. Avoid Short Trips: Short trips, especially those less than 10 miles, do not allow the engine to reach its optimal operating temperature.

In such cases, condensation can build up in the engine, causing the oil to become contaminated. If possible, combine multiple short trips into one longer trip to reduce the frequency of short distance driving.

4. Regularly Check and Maintain Fluid Levels: In addition to oil, it is essential to monitor and maintain other fluid levels, such as coolant and transmission fluid.

Proper fluid levels promote engine efficiency and reduce stress on the oil. 5.

Keep Your Engine Clean: Regularly clean the engine and its components to remove dirt and debris. A clean engine runs cooler and more efficiently, extending the life of your oil.

6. Use High-Quality Oil and Filters: Opt for high-quality synthetic oil and filters that provide better protection and last longer than conventional counterparts.

Consult your owner’s manual or a certified technician to ensure you are using the correct type and viscosity rating of oil. 7.

Follow the Manufacturer’s Recommendations: Adhere to the recommended oil change intervals provided by the manufacturer. These intervals are designed to promote optimal engine performance and oil longevity.

However, if you drive in severe conditions, such as extreme temperatures or stop-and-go traffic, consider more frequent oil changes.

Signs That Your Toyota Prius Needs an Oil Change

While following the manufacturer’s recommended oil change intervals is vital, it is also essential to be aware of specific signs that indicate your Toyota Prius needs an oil change. Look out for the following signs:


Dashboard Warning Light: If the oil pressure or oil change indicator light on your dashboard illuminates, it is a clear indication that your Prius needs an oil change. Do not ignore these warning lights and schedule an oil change promptly.

2. Dark or Dirty Oil: If you check your oil and notice that it is dark brown or black and has a gritty texture, it is an indication that the oil is dirty and needs to be changed.

Clean oil should have a golden-brown color and a smooth texture. 3.

Engine Noise: An increase in engine noise, such as knocking, tapping, or rumbling sounds, can suggest that your Prius needs an oil change. Dirty oil can fail to lubricate the engine properly, resulting in increased friction and noise.

4. Decreased Performance: If you notice a decrease in your Prius’s performance, including sluggish acceleration or decreased fuel efficiency, it may be a sign that the oil is dirty and needs to be changed.

Fresh oil helps to promote optimal engine performance. 5.

Exhaust Smoke: If you observe excessive smoke or a pungent odor coming from your exhaust, it could indicate that the oil is old or contaminated. This can be a sign that your Prius needs an oil change.

In summary, making your oil last longer in a 2010 Toyota Prius involves adopting proper driving habits, regular maintenance, and using high-quality oil and filters. Following these practices can help extend the life of your oil and minimize the frequency of oil changes.

Additionally, being aware of the signs that indicate your Prius needs an oil change allows you to address any issues promptly and ensure the longevity and performance of your vehicle.

The Impact of Oil Quality on the Performance of a 2010 Toyota Prius

Choosing the right oil and maintaining its quality is crucial for the optimal performance of a 2010 Toyota Prius. The quality of the oil can directly impact the engine’s efficiency, lifespan, and overall performance.

Here are some ways in which oil quality influences the performance of your Prius:

1. Lubrication and Reduced Friction: Engine oil serves as a lubricant between the moving parts of the engine, reducing friction and wear.

High-quality oil with excellent lubricating properties forms a protective film on the engine components, minimizing wear and enhancing the overall efficiency of the engine. 2.

Cooling: Oil plays a vital role in removing heat from the engine. It absorbs and carries away the excess heat generated during engine operation, reducing the risk of overheating.

Quality oil with proper viscosity and thermal stability ensures effective heat transfer, preventing engine damage and maintaining optimal performance. 3.

Engine Cleanliness: High-quality oil contains additives that help keep the engine clean by preventing the formation of sludge, deposits, and varnish. These contaminants can accumulate over time and negatively affect the engine’s performance, reducing fuel efficiency and potentially causing damage.

Clean oil ensures that the internal components remain free from debris and operate smoothly. 4.

Fuel Efficiency: Using the right oil of superior quality can enhance the fuel efficiency of your Prius. Quality synthetic oils are specifically formulated to reduce internal engine friction, resulting in improved fuel economy.

With better lubrication and reduced friction, the engine can operate more efficiently, reducing the amount of fuel consumed. 5.

Environmental Considerations: An efficient and well-maintained engine helps to reduce harmful emissions and minimize the environmental impact of your vehicle. Quality oil, along with regular oil changes, ensures that your Prius retains its eco-friendly characteristics by keeping the engine operating at optimum performance levels and reducing emissions.

How to Choose the Right Oil Filter for a 2010 Toyota Prius

Selecting the right oil filter for your 2010 Toyota Prius is crucial to ensure efficient filtration of contaminants and proper oil flow throughout the engine. Here are some steps to help you choose the right oil filter:


Determine the Correct Filter Size: Consult your owner’s manual to identify the correct filter size for your Prius. The manual will provide specifications and part numbers to help you find the right filter.

2. Choose a Reputable Brand: Selecting a reputable and trusted brand for your oil filter is essential.

Brands with a good reputation have undergone rigorous testing to meet quality standards and provide reliable filtration. 3.

Consider the Filter Material: Oil filters are typically made with either cellulose or synthetic media. Cellulose filters are more affordable but have a lower capacity for filtering out smaller particles.

Synthetic media filters offer better filtration efficiency and longer service life. 4.

Check for the Filter’s Filtration Efficiency: Look for an oil filter that offers a high filtration efficiency. This ensures that it can effectively trap and remove harmful contaminants, preventing them from circulating through the engine and causing damage.

5. Evaluate the Filter’s Compatibility with Your Prius: Ensure that the oil filter you choose is compatible with your 2010 Toyota Prius in terms of fit and function.

Check for any specific requirements or recommendations from the manufacturer. 6.

Consult with a Certified Technician: If you are unsure about choosing the right oil filter for your Prius, it is always beneficial to consult with a certified technician or refer to a trusted automotive resource. They can provide expert advice and guidance based on your specific Prius model and driving conditions.

By selecting the right oil filter, you can ensure that the oil flowing through your Prius’s engine is filtered effectively, preventing contaminants from causing damage and preserving the engine’s performance and longevity. In summary, the quality of oil has a significant impact on the performance of a 2010 Toyota Prius.

Choosing high-quality oil that provides proper lubrication, cooling, and cleanliness benefits the engine’s efficiency, fuel economy, and overall performance. Additionally, selecting the right oil filter is essential to ensure effective filtration and proper oil flow.

By considering factors such as filter size, brand reputation, material, filtration efficiency, and compatibility, you can make an informed choice and maintain the optimal performance of your Prius’s engine.

Common Mistakes to Avoid When Changing the Oil in a Toyota Prius

Changing the oil in a Toyota Prius is a routine maintenance task that can be done by the car owner. However, there are some common mistakes that people often make during this process.

Avoiding these mistakes will ensure that the oil change is done properly and the engine remains in good condition. Here are some common mistakes to avoid when changing the oil in a Toyota Prius:


Using the Wrong Oil: One of the most common mistakes is using the wrong type or viscosity of oil. Always refer to the owner’s manual to determine the correct type and viscosity rating of oil recommended for your Prius.

Using the wrong oil can affect engine performance and potentially cause damage. 2.

Not Changing the Oil Filter: Neglecting to change the oil filter during an oil change is a mistake that can reduce the efficiency of the new oil. The oil filter plays a critical role in removing contaminants from the oil.

Always replace the oil filter when changing the oil to ensure clean and properly filtered oil circulates throughout the engine. 3.

Overfilling or Underfilling the Oil: It is crucial to add the correct amount of oil to the engine. Overfilling can lead to excessive pressure, oil foaming, and potential engine damage.

Underfilling can cause inadequate lubrication, resulting in increased friction and wear. Consult the owner’s manual for the recommended oil capacity, and use the dipstick to ensure the oil level is within the appropriate range.

4. Not Torquing the Drain Plug and Filter Properly: Failing to tighten the drain plug and oil filter adequately can lead to leaks, oil loss, and engine damage.

Always torque the drain plug and filter according to the manufacturer’s specifications. Use a torque wrench if necessary to ensure proper tightening.

5. Improperly Positioning the Jack Stands: When raising the car to access the oil drain plug and filter, make sure to position the jack stands correctly.

Placing the stands in the wrong position can cause the car to become unstable and result in accidents or damage to the vehicle. 6.

Improperly Disposing of the Used Oil and Filter: When changing the oil, it is important to properly dispose of the used oil and the old oil filter. Improper disposal can harm the environment.

Take the used oil and filter to a certified recycling center or a facility that accepts used oil and filters for recycling. 7.

Forgetting to Reset the Oil Maintenance Light: After completing the oil change, it is essential to reset the oil maintenance light on the dashboard. Forgetting to reset the light will result in inaccurate maintenance reminders.

Refer to the owner’s manual for instructions on resetting the oil maintenance light.

How to Reset the Oil Maintenance Light on a 2010 Toyota Prius

Resetting the oil maintenance light on a 2010 Toyota Prius is a simple process that can be done after completing an oil change. Here’s how to reset the oil maintenance light:


Turn on the Ignition: Insert the key into the ignition and turn it to the “On” position without starting the engine. Make sure all other accessories are turned off.

2. Access the Multi-Information Display: Use the buttons on the steering wheel to navigate to the Multi-Information Display (MID) screen.

This screen displays various vehicle settings and information. 3.

Select “Maintenance Info”: Once you’ve accessed the MID screen, use the buttons on the steering wheel to scroll through the available options. Locate and select “Maintenance Info” on the screen.

4. Reset the Maintenance Reminder: After selecting “Maintenance Info,” you will see options like “Oil Maintenance” or “Reset.” Choose the appropriate option and follow the prompts to reset the maintenance reminder.

5. Confirm the Reset: After completing the reset process, the screen will display a confirmation message indicating that the oil maintenance light has been reset.

It’s important to note that the specific steps for resetting the oil maintenance light may vary slightly depending on the Prius model and year. If you encounter any difficulties, refer to the owner’s manual or consult a certified technician for assistance.

In conclusion, avoiding common mistakes when changing the oil in a Toyota Prius is essential for maintaining the engine’s performance and longevity. Using the correct oil, changing the filter, ensuring proper oil levels, torquing components, and disposing of used oil properly are all important considerations.

Additionally, resetting the oil maintenance light after an oil change ensures accurate maintenance reminders. By following these guidelines and being mindful of these common mistakes, you can perform an oil change on your Toyota Prius correctly and keep your engine running smoothly.

Precautions to Take When Performing Oil Maintenance on a Toyota Prius

Performing oil maintenance on a Toyota Prius is a relatively straightforward task that can be done by car owners. However, it is essential to take certain precautions to ensure the safety of yourself, the vehicle, and the environment.

By following these precautions, you can perform oil maintenance on your Prius efficiently and effectively. Here are some precautions to take when performing oil maintenance:


Safety First: Before you begin any work, ensure that you are wearing appropriate safety gear, such as gloves and safety glasses. This will protect your hands and eyes from any potential harm.

2. Allow the Engine to Cool: Oil can reach high temperatures during engine operation.

To prevent burns, always allow the engine to cool down completely before performing any oil maintenance. This will also ensure that the oil settles in the oil pan for an accurate reading.

3. Work on a Level Surface: Park your Prius on a flat and level surface to prevent the car from rolling or shifting during the oil change.

This will enable you to work safely and make it easier to drain the oil properly. 4.

Use Proper Jacking Techniques: If you need to raise the vehicle to access the underside, use a jack and jack stands following the proper techniques outlined in your owner’s manual. Ensure that the jack stands are positioned securely and that the vehicle is stable before getting underneath.

5. Use the Correct Tools: Having the right tools for the job is crucial for a successful oil change.

Use a wrench that fits the drain plug properly and an oil filter wrench to remove the old oil filter. Using the correct tools will help prevent damage to the drain plug and filter housing.

6. Dispose of Used Oil Properly: Used motor oil is hazardous to the environment if not disposed of correctly.

Never pour used oil down drains, sewers, or onto the ground. Instead, collect the used oil in a suitable container and take it to a certified recycling center or a facility that accepts used oil.

7. Avoid Overfilling: Adding too much oil to the engine can cause excessive pressure and foaming, leading to damages.

Always refer to the owner’s manual to determine the correct oil capacity and use the dipstick to check the oil level as you fill. 8.

Tighten Components Securely: When reinstalling the drain plug and the new oil filter, ensure that they are tightened securely. However, be cautious not to overtighten them, as it can lead to leaks or damage.

Refer to the manufacturer’s specifications for proper torque values. 9.

Double-Check for Leaks: After performing an oil change, it is essential to double-check for any signs of leaks. Start the engine and let it run for a few minutes, then inspect the drain plug and filter housing to ensure there are no oil drips or leaks.

Address any leaks immediately to prevent further damage. 10.

Reset the Oil Maintenance Light: Always reset the oil maintenance light on the dashboard after completing an oil change. Failure to do so may result in inaccurate maintenance reminders.

11. Follow Manufacturer’s Recommendations: Adhere to the manufacturer’s recommendations regarding oil type, viscosity rating, and oil change intervals.

Following these guidelines will help maintain your Prius’s warranty and ensure optimal performance. By taking these precautions when performing oil maintenance on your Toyota Prius, you can maintain a safe work environment, prevent potential damage to the vehicle, and promote environmental responsibility.

As always, if you are unsure or uncomfortable performing the oil change yourself, consult a certified technician or take your Prius to a trusted service center for professional assistance. In conclusion, oil maintenance is vital for maintaining the performance, efficiency, and longevity of a 2010 Toyota Prius.

By understanding the importance of oil maintenance, how often to change the oil, an

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