The functions and benefits of motor oil cannot be underestimated, and Motor oil performs three critical functions for your car. It lubricates the internal combustion engine, which generates a lot of friction. It also cools down an internal combustion engine, which creates a lot of heat. And it cleans engine parts, which can get dirty.

Several motor oils are available specifically about the Toyota Prius, but choosing the right one can be tricky.

That’s why here are our picks for the best motor oil for Toyota Prius;

Best Motor Oil For Toyota Prius Reviewed

Idemitsu Full Synthetic Engine Oil

Idemitsu Full Synthetic Engine Oil

Key Details:

  • Viscosity – 5W-20
  • Liquid volume 160 ounces
  • Best for environment

Idemitsu engine oils offer enhanced wear protection in some of the most demanding operating conditions. 

The unique combination of the highest quality synthetic base oil and high-performance additive components enables engines to achieve maximum efficiency, torque, and horsepower. 

By minimising wear and maintaining the engine virtually free of harmful deposits, Idemitsu engine oil helps extend engine life.

This particular oil is also very eco friendly and is known for the little to no side effects on the environment.

Talking about the oil, according to their specs, the oil itself doesn’t have a good flashpoint (232 Celsius) or Viscosity (169). All other major brands have a better Flashpoint and Viscosity than Idemitsu.

This fuel is Japanese based and is often used in many auto machines, thus making a good reputation. This is the perfect fuel for you if you are aiming for a more eco-friendly solution.


Pros
  • Not harmful to the environment
  • Reduces raw brunt fuel
Cons
  • Expensive motor oil

TOYOTA Full Synthetic Oil

TOYOTA Full Synthetic Oil

Key Details:

  • Viscocity 0w-20
  • Liquid volume 384
  • Best for overall

Made by Exxon-Mobil according to Toyota specifications. Some may argue if Exxon-Mobil makes it, then it’s similar to Mobil 1 0w20. Why bother paying more for this oil if you can buy Mobil 1 at a lesser price. 

If you look at the specs of this oil TGMO, you will notice that the additive package is very different from Mobil 1. Viscosity index is also significantly higher on the TGMO. It’s one of the highest for a 0w20 synthetic oil.

Why buy this oil then? If you want an oil that will perform very well when used on a Toyota with 10000mi OCI and still have a lot of life left in the oil at 10000mi, this is your oil. Toyota takes pride in the dependability of its cars. That’s why they have oil made for their cars according to their specification.

Other 0w20 oil will do fine on a Toyota and will be sufficient to last the 10000mi OCI. But, TGMO is explicitly made for Toyota. It costs a little bit more, but it gives me peace of mind, then it’s worth it.


Pros
  • Zero to no leaking
  • Great synthetic oil
Cons
  • Quantity of product varies a lot

Castrol Full Synthetic Motor Oil

Castrol Full Synthetic Motor Oil

Key Details:

  • Viscocity 0W-20
  • Liquid volume 160 ounces
  • Best for engine protection

Castrol EDGE is one of Castrol’s most advanced engine oil. It has a fully synthetic oil designed for those who demand the best performance from their cars. Castrol EDGE also happens to be recommended by leading car manufacturers.

 It is engineered with fluid titanium technology that physically changes the way the oil behaves under pressure. As a result of increased demand for performance and fuel economy, pressures in today’s engines have almost doubled over the last three decades.

While using this oil, my car ran smoothly and strong like the first day, and the engine has never been opened or repaired other than regular maintenance and cover and pan gaskets. 

One of the only problems you could face with this is that it is not verified for many brands now, mainly including BMW, which has lost some of its popularity.


Pros
  • Excellent engine and gear protection
  • Better cooling feature than most motor oils
Cons
  • Not suitable for a variety of vehicles

Mobil 1

Mobil 1

Key Details:

  • Viscosity – 5W-30     
  • Liquid volume – 33.81 ounces  
  • Best for diesel cars

Mobil 1 ESP Formula 5W-30 is an advanced performance synthetic motor oil made with a proprietary blend of leading-edge components formulated to be fully compatible with the latest Diesel Particulate Filters (DPF’s) and Gasoline Catalytic Converters (CAT’s). 

You can’t go wrong with Mobil 1 oils. At my changes, I have not noticed anything with the quality of the oil to arouse any concerns. It also sucked the oil out of the dipstick tube with a vacuum extractor, and it has worked out well.

 This is the oil recommended for use in diesel cars. You have to make sure you use the correct oil, or the oil will become caustic in Diesel engines and ruin the engine.

The oil is excellent for direct-inject engines as it minimises the oil vapours and is much easier to replace and reuse. Although this doesn’t provide the most dexterity with its performance, it is still an excellent choice for everyday use for your Prius.


Pros
  • An excellent choice for diesel variety of vehicles
  • Provides higher RPM than most motor oils
Cons
  • The quality of the oil is not consistent.

AMSOIL Synthetic Motor Oil 

AMSOIL Synthetic Motor Oil 

Key Details:

  • Viscocity – 0w-20
  • Liquid volume 128 ounces
  • Best for fuel economy

The AMSOIL motor oil delivers extraordinary lubrication for your car. It combines the industry premier synthetic technology and additives into a light viscosity formulation that withstands high temperatures and delivers outstanding fuel economy and cold temperature performance. 

AMSOIL replaces SAE 5W-20, and I would recommend it for extended drain intervals. This oil was made to deliver long-lasting performance and protection.

It provides standard service for up to 25,000 miles or one year – whichever comes first – and severe service for 15,000 miles. 

This is one of the best available fuels for cutting short your maintenance costs, albeit, on the slightly expensive side, it is definitely worth the money.

For all of you who tend to drive around a lot, especially uber/lift drivers, this is the motor oil I would recommend for you because of its excellent fuel economy and the fact that this will save hundreds of dollars on maintenance fees. 


Pros
  • Reduced oil consumption
  • Good choice for operating in higher temperatures
Cons
  • Slightly expensive oil

Nissan Motor Oil

Nissan Motor Oil

Key Details:

  • Viscocity – 0W-20
  • Liquid volume 192 ounces
  • Best lightweight oil

This oil is suitable for all makes and models that require 0W-20 Motor Oil, and it outperforms many of the conventional and synthetic blends.

It also happens to have high-temperature protection that goes up to 400 degrees F and meets ILSAC GF-5 API, SN, SM, SL requirements.

I liked the lightness of it, suitable for light-duty use & maximising mileage.

Sodium add pack with low calcium ensures less ash left behind, good for the emissions system.

 I have used Toyota OE brand oil and this. About the same, except this, is $10 cheaper for the six-pack. Mobil makes this, and I don’t see any difference in engine performance, no measuring other than burn-offs. Also, low mass loss in testing is a beneficial feature.

 The content sheet has almost no moly vs Toyota, and Mobile AFE has much higher detergent and antiwear additives, thus making it a clean engine oil that meets my 5000-mile oil change interval.


Pros
  • Better for your engine as it is lightweight
  • Provides better flow of oil
Cons
  • Increased friction in gears

Liquimoly Motor Oil

Liquimoly Motor Oil

Key Details:

  • Viscocity – 0w-20
  • Liquid volume – 169 ounces
  • Best for protection 

This oil offers fully synthetic low viscosity premium-class motor oil, which is developed to meet the high demands of modern Asian and American gasoline engines. 

The innovative additive technology guarantees one of the best wear protection and engine cleanliness, lowest oil and fuel consumption and highest engine efficiency. 

This oil is ideally suited for engines with direct injection (GDI) and turbochargers. It is recommended to use this with extended oil change intervals as per manufacturer guidelines.

My Toyota Prius originally made a harsh sound when it started, so much so that most wondered if it was a diesel car, but after I put this stuff in and my engine sounds like a sewing machine, it hums now. Valves turned quiet, and the engine just clicked along like a fine-tuned precision piece. 

The startup is quiet. I was highly impressed by this and would suggest you buy this if you face similar problems.


Pros
  • Increased lifespan for gears and engine
Cons
  • Thicker fuel reduces the smooth flow of oil.

Genuine Honda Motor Oil

Genuine Honda Motor Oil

Key Details:

  • Viscosity –  0W-20
  • Liquid volume 32 ounces
  • Best for engine performance

Honda genuine fluids are the exact original equipment manufacturer (OEM) fluids that your vehicle came with. 

When you select a genuine OEM fluid – you can rely on the high quality and effectiveness of the product and brand without having to guess if the product will work in sequence with your vehicle.

Protecting your investment is essential, and choosing suitable fluids can be challenging. So if you are the type who does not want to risk exposing your car to cheap knock-off oils, I suggest you stick to the original and authentic oils like Hondo motor oil.

After using this oil, you will notice that the performance of your engine Increases, and so does your RPM. After using this oil, I could feel the engine is faster climbing to the higher RPMs, hear the swoosh when Vtec is in the RPM range, and feel a rush of power from this engine.

For improving your engine performance, this is one of the best available options in the market. Although this is relatively expensive, you cannot put a price on quality.


Pros
  • Reduces formation of sludge
  • Increased corrosion protection
Cons
  • Expensive motor oil

ACDelco Full Synthetic Motor Oil

ACDelco Full Synthetic Motor Oil

Key Details:

  • Viscocity – 5W-30
  • Liquid volume 30 ounces
  • Best for engine cleanliness

Adecco Dexos1 Gen2 Full Synthetic 5W30 Engine Oil is specifically designed to help improve engine cleanliness, performance, and efficiency with its high-quality base stocks. The motor oil helps support the functionality of your engine within several faces.

I have been using this fuel for quite some time now because it’s affordable and because it gives you more quantity than others. After using this, I realised that my engine is quieter and more responsive on the throttle. This has made a weirdly big difference in my car experience.

While changing from one motor oil to another, knowing whether that particular motor oil will suit your car is imperative. This specific product is good and reliable enough to be a massive advantage to your vehicle.

This product comes in sets of 6 and is known for its great pricing. 


Pros
  • Cheap and affordable prices
  • Better quantity of oil per buy
Cons
  • It does not provide good protection against heat. 

Castrol Motor Oil

Castrol Motor Oil

Key Details:

  • Viscocity – 5w 20
  • Liquid volume 160 ounces
  • Best for reduced eternal friction

Engine oils need to be able to respond to changing environments in your engine consistently. During every moment of the drive, your engine oil needs to react to the needs of different metal-to-metal contact points in your engine, each with different demands, pressures and temperatures.

Castrol premium full synthetic oil is engineered with fluid titanium technology that provides unsurpassed protection for critical engine parts, ensuring optimal performance and the strength to enable an extended drain interval of up to 20,000 miles.

We do not recommend extended servicing in severe service applications such as racing, frequent towing or hauling, commercial use, extremely dirty/dusty conditions or excessive idling.

5W-20 oil is a lighter viscosity than 5W-30 oil. Therefore, it has less internal engine frictional losses or less drag on the crankshaft, pistons, and valvetrain, promoting increased fuel economy.


Pros
  • The oil insurers zero to negligible friction.
  • Better operating speeds of the engine can be achieved.
Cons
  • The oil needs to be replaced frequently.

Factors to consider before buying motor oil for your Toyota Prius 

Recommendations by manufacturer 

The manufacturer’s recommendations are essential to consider while choosing the right motor oil for your Prius. This is important because it provides the best performance for your engine and keeps your engines in good shape, thus increasing their lifespan.

From the manufacturer point of view, TOYOTA Full Synthetic Oil is the best oil.

Viscosity

The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of “thickness.”

Lower Viscosity

A fluid with low viscosity flows easily because its molecular makeup results in very little friction when it is in motion.

This means that oil with lower viscosity will always be easier on the engine, especially in the winter season when the temperature is low. 

Amongst our products, Nissan Motor Oil has the best low viscosity oil.

Higher viscosity

A fluid with higher viscosity provides more friction and is perfect for the summers when the temperatures are soaring.

Amongst our products, ACDelco Full Synthetic Motor Oil has the best high viscosity oil.

Detonation properties

Another important feature of oil is its detonation properties. In an ordinary combustion chamber, premature ignition can lead to very dangerous detonation.

If you use an oil with very low anti detonation properties, it is possible that at high RPMs, your engine will detonate.

Amongst our products, TOYOTA Full Synthetic Oil has the best anti detonation properties.

Our pick for the best motor oil for Toyota Prius

TOYOTA Full Synthetic Oil is the best choice mainly for one reason, and it is the recommended oil by the manufacturers custom-designed for that particular engine. On top of this, the oil provides excellent anti detonation properties, thus eliminating chances of premature ignition.

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