Best Synthetic Motor Oil 2021

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Best Full Synthetic Oil 5w30

Best Synthetic Oil 5w40

Best Synthetic Oil 10w30

Best Synthetic Oil 0w20

Best Synthetic Oil 0w16

Best Synthetic Oil 15w40


Are you eager to keep your motor safe and sound for a long period? Do you dream about increasing the automobile’s mileage? Are you tired of the employment of conventional oil for lubrication? It’s not a secret that changing oil is a step forward to prolonging the lifespan of your motor and reaching its best productivity. Hence, it’s crucial to opt for the oil, which will contribute to your motor’s smooth functioning plus brilliant condition.

Seeking a lubricant for your motor, you will come across two possible options: synthetic and conventional. The latter is crude oil or a by-product of crude oil whereas synthetic oil is a chemically modified petroleum product.

Automobile owners tend to give preference to synthetic oil after the car’s run-in period. There are many brands, manufacturing synthetic oils, and the majority of them prove to be pretty reliable. Our guide will assist you in picking up the most appropriate variant for your automobile.

While selecting the oil, give preference to the one recommended by your car manufacturer and which is highly estimated by other drivers. We have held our own research and now, we are ready to share the results with you. Here are 10 best synthetic motor oils.




 Synthetic Oil Reviews


Castrol 03084C Edge 5W-30 Advanced Full Synthetic Motor Oil

Castrol 03084C Edge 5W-30 Advanced Full Synthetic Motor Oil, 5 Quart
14,152 Reviews
Castrol 03084C Edge 5W-30 Advanced Full Synthetic Motor Oil, 5 Quart
  • Advanced premium full synthetic motor oil to offer strength under extreme pressure
  • Titanium strong for maximum engine performance
  • Reduces metal-to-metal contact across a range of different driving speeds
  • Protects the engine for the entire drain interval even under extreme pressure
  • Decreases engine deposit formation to help maximize engine response

Castrol 03101 EDGE is first-class synthetic oil, contributing to efficient lubrication and smooth operation of every motor’s component.

Lubrication and Protection Qualities  

Undoubtedly, this oil is great at providing each engine’s internal part with perfect lubrication. Thus, you can be calm that there is no metal or just a little part of it on metal contact no matter what speed you are driving at. Additionally, this synthetic oil saves you from the formation of deposits in your motor. Consequently, it helps your motor to function steadily and have a greater lifespan.

Viscosity Features

The viscosity index of this oil equals 0W-40, signifying that it goes well with cold temperatures and in the winter season. If you live in a region with cold winters but aren’t ready to sacrifice the health of your motor, you can surely acquire this oil to avoid the engine’s malfunctions because of low temperatures. Simultaneously, this oil works rather efficiently under high temperatures though its productivity decreases a little in comparison with colder seasons. Thus, if you live in a region with a hot climate, pay attention to some other options.

Composition Particularities

This oil’s excellent quality raises it to the top of the list. Nevertheless, its main distinction from its rivals is its unique fluid titanium technology. Very often, oil’s productivity may fall due to the high pressure produced by contemporary motors. But Castrol is enforced with titanium, assisting the oil to withstand the pressure and keep its lubrication qualities.


As a rule, this oil is compatible with the majority of contemporary motors. Still, owners of European automobiles, including the ones of Volkswagen, Ford, BMW, Porsche and Mercedes Benz, will remain absolutely content with the service this oil provides. Moreover, it can contribute to enhanced fuel efficiency to boot.


Mobil 1 Advanced Fuel Economy 120758 Advanced Full Synthetic Motor Oil

Mobil 1 Advanced Fuel Economy 120758 Advanced Full Synthetic Motor Oil for 0W-20 5, 4.73L, 5 quart
1,536 Reviews
Mobil 1 Advanced Fuel Economy 120758 Advanced Full Synthetic Motor Oil for 0W-20 5, 4.73L, 5 quart
  • For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
  • Low viscosity, advanced full synthetic formula; helps increase engine efficiency and improve fuel economy up to 2 percent
  • Outstanding thermal and oxidation stability; helps reduce oil aging, resulting in long lasting protection
  • Outstanding low-temperature capabilities; quick cold-weather starting and fast protection helps extend engine life
  • Precisely balanced additive component system

Being first released about a century ago, Mobil 1 oils remain among the most widespread and reliable ones.

Basically, it’s the world’s foremost synthetic motor oil brand, employed by a greater number of automobile manufacturers (comprising Porsche and Mercedes) and NASCAR teams than any of its rivals. You will definitely commit no mistake by choosing motor oil by Mobil 1.

Brand’s extended performance synthetic motor oil was created concretely to prolong oil change intervals, making it possible to change the oil after driving at least 15,000 miles.

Mobil 1 proved the efficiency of its oil by getting HSV Z Series Maloo R8 Ute (the fastest in the world) to driving about 23,000 miles around Australia without an oil change. As a result, the motor turned out to be as clean as it was before the experiment started.

The company reached such astonishing results thanks to integrated SuperSyn technology, keeping oil anti-wear qualities operating at the best level under very low and very high temperatures. It features some other additional features, offering fantastic thermal plus oxidation stability.

So, this item is a perfect option if you seek oil, able to function at a top-level no matter what temperature is. Furthermore, the brand offers many other options, from 0W-20 to 10W-30 and more.

In general, this motor oil provides outstanding longevity and reliability at reasonable money. It will definitely cope with keeping your motor safe and sound.


Pennzoil Ultra Platinum Full Synthetic 5W-30 Motor Oil

Pennzoil Ultra Platinum Full Synthetic 5W-30 Motor Oil (1 Quart, Single Pack) (550040865)
6,613 Reviews
Pennzoil Ultra Platinum Full Synthetic 5W-30 Motor Oil (1 Quart, Single Pack) (550040865)
  • Full synthetic 5W-30 engine oil made from natural gas, not crude, using Pennzoil's patented gas-to-liquid PurePlus Technology
  • No other leading motor oil provides better wear protection for your engine (Based on Sequence IVA wear test using SAE 5W-30)
  • Helps protect engines from loss of power and provides better fuel economy—drive on average an extra 550 miles per year (versus a dirty engine)
  • Keeps pistons dramatically cleaner than required by the toughest industry standards (Based on ILSAC GF-6 and Sequence IIIH piston deposit test using SAE 5W-30)
  • Delivers unsurpassed sludge protection to help keep high-performance and luxury car engines as close as possible to factory clean (Based on Sequence VH Sludge Test using SAE 5W-20)

Being noted for ensuring excellent maintenance plus demonstrating fantastic protective properties, Pennzoil Platinum Oil is known around the world.

Lubrication and Protection Qualities

This oil is famed for ensuring high-grade lubrication and keeping motors clean. Thus, undoubtedly, all your motor’s internal parts will get a decent level of lubrication. While driving, these parts won’t rub one another and will operate faultlessly. Moreover, it saves motors from debris, dirt and minor particles, which can prevent them from normal operation.

Thus, there will be no need to change oil too frequently, making motor maintenance much easier. Moreover, this is good news as you spend a bit more anytime you acquire a bottle of this oil.

Viscosity Features

The SAE weight of this oil equals 5W-40, ensuring that the viscosity index will always be proper no matter how high or low temperature is. So, if you live in a region, where the weather can be both warm and cold, you can feel safe from oil getting too thick or too fluid. So, every engine’s part will always remain sufficiently coated with oil no matter what ambience is.

Composition Particularities

This oil’s main distinction from its rivals is the addition of cleansing substances. They ensure that your motor will wear out more slowly. Simultaneously, all the admixtures are added in the perfect proportion in order not to prevent the oil from smooth functioning until the time for its substitution comes.


The brand developed this formula for a long period to ensure that it can go well with various automobiles. It’s also compatible with such automotive brands as Honda, Ford, GM and Chrysler. Nevertheless, the fuel efficiency of these brands’ vehicles won’t enhance if Pennzoil oil is applied.


Valvoline SynPower Synthetic Motor Oil

Valvoline SynPower Synthetic Motor Oil, 5W-20, Case of 6 (927-C)
  • Valvoline SynPower Synthetic Motor Oil, 5W-20, Case of 6 (927-C)

Valvoline is another trustworthy manufacturer of motor oils. Its SynPower lineup comprises full synthetic motor oils, providing proper protection at high temperatures plus excellent cleaning properties. So, it will contribute to your automobile’s fuel efficiency even when it gets older.

Actually, this synthetic oil is compatible with almost all passenger automobiles popular in the United States and Canada. It’s reported to serve faultlessly up to 10,000 miles, more than many other oils for sale.


Liqui Moly 2041 Premium Synthetic Motor Oil

Liqui Moly 2041 motor oil is very multi-sided and will easily cope with keeping your motor plus its internal parts in outstanding condition.

Lubrication and Protection Qualities

Liqui Moly 2041oil is so skilled in lubricating and protecting a motor that there is no need to depend on maintenance as strongly as you did before. Greasing all the engine’s internal parts, it prevents them from rubbing each other. Consequently, it slows down the motor’s weariness. Additionally, it saves the motor from dust, dirt and debris, ensuring its high productivity.

Viscosity Peculiarities

Keeping the SAE weight of 5W-40, this oil flows smoothly and efficiently, lubricating all the components sufficiently no matter what season or weather is. This oil was created to resist both extremely high and extreme cold temperatures. It saves you from worries about the engine’s productivity. However, prior to acquiring this oil, make sure that it’s compatible with your automobile. It goes well with not all brands and models.

Composition Quality

Due to special admixtures, Liqui Moly oil reduces the level of wear and tear of the engine plus its internal parts. All the ingredients of this oil do their best to reach each part of the motor and ensure its steady operation even in long run.


The bad news is that this oil isn’t compatible with many motors. For example, it shows great results while working with gas and diesel motors along with the ones having the latest engineering concepts. BMW, Volkswagen, Porsche plus Mercedes Benz motors will run smoothly with this oil. Moreover, some enhancement in mpg is possible while driving.


Royal Purple 51530 High Performance Motor Oil

Royal Purple 51530 High Performance Motor Oil 5W-30 (5QT)
2,905 Reviews
Royal Purple 51530 High Performance Motor Oil 5W-30 (5QT)
  • Better wear protection
  • Increased protection against LSPI
  • Increased fuel efficiency
  • Better protection for vehicle exhaust emissions equipment
  • Improved compatibility with fuels containing ethanol

Royal Purple has proved to be rather a trustworthy company, providing high-class automobile care. Its line of high-performance synthetic engine oils always gets to the list of top automotive products and is a great option for high-performance automobiles.

It’s a fact that some synthetic oils fail to keep their shape under the pressure of increased engine’s speeds, temperature and load. As a result, motor’s fuel economy falls and the engine degrades. So, many oil manufacturers try to create a formula able to withstand extreme temperatures and pressure. And Royal Purple seems to find a solution.

Furthermore, this oil is consonant with conventional, blended and other synthetic motor oils. So, you are free to start applying it without getting rid of the existing oil.

Nevertheless, the brand advises to employ it after driving at least 2,000 miles or after the first oil change.

The owners of high-performance automobiles as well as people, residing in regions with harsh weather conditions, will definitely like this oil. Moreover, it will be a good choice if you are eager to lessen the stress your engine is subjected to or if you use your automobile on a daily basis. This Royal Purple oil will cope with all the tasks, keeping your motor clean and looking as if it was absolutely new.


Valvoline High Mileage with MaxLife Technology Synthetic Blend Motor Oil

Valvoline High Mileage with MaxLife Technology SAE 5W-30 Synthetic Blend Motor Oil 5 QT
10,607 Reviews
Valvoline High Mileage with MaxLife Technology SAE 5W-30 Synthetic Blend Motor Oil 5 QT
  • Enhanced anti-wear additives deliver a thick & durable layer of anti-wear film to help prevent auto engine breakdown
  • Added detergents help protect against sludge and deposits
  • Premium seal conditioners help treat and prevent leaks
  • Superior antioxidants resist motor oil breakdown in extreme conditions

Valvoline’s MaxLife Mileage 5W-30 Motor Oil was concretely developed for automobiles with motors, which ran more than 75,000 miles. So, there is no sense in utilizing this oil for brand new vehicles or the ones with mileage less than 50,000 miles.

Some customers state that they receive the wrong product. The MaxLife is reported to have the Dexos seal, but many customers got this oil without it. Clearly, the absence of the Dexos seal doesn’t decrease the efficiency of this oil as this problem is usually a fault of online sellers. So, if you want to get the right item, make orders only at reputable sites.

Both new and old customers of the Valvoline company liked this oil. Note that even if your automobile doesn’t suit the exact SAE of 5W-30, numerous grades do exist.

De facto, the additives deal with 4 basic reasons of motor failure – leakage, deposits, rubbing plus dirt. The manufacturer advises using this oil after your automobile’s mileage exceeds 75,000 miles.

To sum up: if you have an old motor and want to add a boost to it, MaxLife will be the perfect solution.


Schaeffer Manufacturing Co. 9000-006S Supreme 9000 Full Synthetic Engine Oil

Schaeffer Manufacturing Co. 9000-006S Supreme 9000 Full Synthetic Engine Oil 5W-40, 1 gallon
110 Reviews
Schaeffer Manufacturing Co. 9000-006S Supreme 9000 Full Synthetic Engine Oil 5W-40, 1 gallon
  • New packaging coming! Red bottles contain the same great product as the black bottles.
  • Improves engine durability without affecting fuel economy.
  • Keeps engines cleaner: minimal sludge, soot and carbon buildup.
  • Friction modified with Micron Moly and Penetro to reduce friction, wear and scuffing.
  • Resists thinning at high temperatures

Schaeffer synthetic motor oil is a product of top-class, able to increase your motor’s lifespan.

Lubrication and Protection Properties

It’s definitely one of the most efficient engine oils, lubricating all internal components of the motor and decreasing friction between them. Consequently, each detail operates efficiently and in harmony with other parts. It leads to improved longevity of each detail and engine in whole.

Likewise, Schaeffer oil deals with reducing the possibility of any deposits, comprising dirt, carbon build-up plus soot. So, this oil will be ideal if you are seeking for the ways to enhance your motor’s durability. The only minus of this oil is that it’s pretty costly.

Viscosity Peculiarities

This oil performs its functions properly no matter what temperatures it’s subjected to. Thus, even if the weather is frosty, this oil will brilliantly cope with proper lubrication of all components, allowing you to drive off shortly after starting your motor. Similarly, under hot temperatures, the oil doesn’t become too fluid and always ensures a sufficient level of protection.

Composition Particularities

Schaeffer’s formula comprises friction-modifying admixtures such as Micron Moly and Penetro. Thus, it brilliantly decreases rubbing between motor’s parts and enhances the motor’s overall productivity.


Its main shortcoming is that this oil is suitable for diesel engines only, so the number of vehicles it works well with will be rather limited.


Mobil 1 Advanced Fully Synthetic Motor Oil

Mobil 1 Advanced Fully Synthetic Motor Oil, OW-20, Case of 6 (MOBIL10W20-C)
  • Mobil1 Advanced Fully Synthetic Motor Oil, OW-20, Case of 6 (MOBIL10W20-C)

Mobil 1 synthetic oil is elastic, allowing you to spend less time on oil maintenance comparing to other brands.

Lubrication and Protection Peculiarities

This synthetic oil provides your motor with powerful lubrication, building a protective layer between all the relevant details plus reducing the possibility of friction between them. Consequently, the weariness of your engine will slow down considerably.

However, this oil is noted not only for increasing the engine’s lifespan but also for keeping it clean. So, oil maintenance will be required not very frequently. At the same time, though you save your time, you won’t save your money as this product is pretty pricey.

Viscosity Qualities

Keeping the SAE weight of 0W-20, this oil is ideal for winter or regions with cold weather. It shows amazing results at preserving a low viscosity index under low temperatures. Consequently, this oil will run smoothly and will provide each detail with the necessary coating. Moreover, this Mobil 1 product doesn’t become too liquid in summer or under hot temperatures.

Composition Particularities

This foremost Mobil 1 formula signifies that all admixtures are properly balanced within the oil. Thus, you are free to feel all their advantages, comprising long-lasting oil, which will allow your motor to work steadily pretty long.


This oil is suitable for a vast number of vehicles, comprising Honda, Toyota, Nissan and GM regardless of what motors they keep. However, the improvement in the mpg is possible, but not guaranteed.


Idemitsu Full Synthetic Engine Oil

Idemitsu Full Synthetic 0W-20 Engine Oil SN/GF-5 - 5 Quart
454 Reviews
Idemitsu Full Synthetic 0W-20 Engine Oil SN/GF-5 - 5 Quart
  • For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
  • 5 quart container of full synthetic 0W-20 engine oil - API SN, ILSAC GF-5
  • Maximizes fuel economy by combining synthetic base oils with advanced friction modifying additive technologies
  • Provides outstanding protection against engine wear while minimizing formation of deposits, even under extreme conditions
  • Engineered for high piston cleanliness which means less oil burn-off and reduced emissions

Idemitsu synthetic oil provides maximum lubrication plus protection for the engine’s internal components and allows them to operate smoothly.

Lubrication and Protection Features

This oil is a decent choice for drivers, who are eager to provide their motors with maximum protection but aren’t ready to spend much money on that. Though the brand isn’t so popular, it produces oils of good quality. Thus, the oil will perform all the necessary functions properly and ensure the steady work of your motor, contributing to its better longevity as well.

Viscosity Qualities

The Idemitsu oil with the weight of 0W-20 operates faultlessly even in frosty winters. Thanks to such a viscosity rate, it preserves its structure no matter how low the temperature is, providing sufficient greasing for each detail. This oil can be suitable for a warm climate as it doesn’t become too fluid if the temperature rises.

Composition Quality

This product reaches such an excellent level of lubrication thanks to featuring some friction-minimizing additives. Moreover, this formula keeps some admixtures, which assist in reducing deposits in the motor system. Consequently, the motor doesn’t need any special maintenance but will serve longer, showing great productivity.


Being considered to be top-quality and high-productive oil, this product isn’t compatible with all automotive brands. For instance, it may fail to meet the requirements of some luxury brands. However, it’s suitable for the majority of middle-class vehicles. Moreover, in some cases, it may even enhance fuel efficiency.


How to Choose The Best Synthetic Motor Oil?

Oil is such a component of your automobile, which can’t be ignored and must be serviced on time in order to provide the vehicle’s steady functioning. Many drivers neglect oil changing, trying to save some money and time. But actually, by neglecting your motor, you gradually increase the expenditures on your vehicle and, consequently, pay much more than you could spend on oil maintenance.

Synthetic oils have proved their efficiency, but some automobiles may need semi-synthetic ones with low ash rates. Some oils are modified specifically for old cars while others are created with great resistance to cold temperatures.

In order to make the process of choosing motor oil a bit easier, we have prepared some tips for you, which will make you aware of what exactly you need.


What’s the Difference Between Synthetic and Conventional Oil?

Conventional oil is natural oil on a mineral basis, refined from crude oil. Such oils are pretty affordable but require frequent change. Moreover, they provide the minimum level of protection for the engine’s internal components.

Synthetic oil is a mix of natural and artificial oils or just artificial oil, fabricated at a chemical laboratory. It ensures maximum lubrication for each engine’s part plus is more resistant to high temperatures than its conventional rivals. Though its price is higher, it serves for a longer period and contributes to the longevity of your motor.

Actually, there are fully synthetic and semi-synthetic oils. The latter is a mix of synthetic oil with conventional one while fully synthetic oil is a product of chemical reactions with no natural components.

Viscosity Level

Motor oil’s viscosity signifies the oil’s resistance to flow and shearing. In simple words, imagine water and syrup. Water has a low viscosity level as it’s more liquid whereas syrup keeps a greater viscosity index because it’s thicker.

So, it’s significant to select the oil with the proper viscosity index for your engine. Usually, you can get this information from a manufacturer’s guide. However, you can opt for the oil, taking into account driving conditions, weather and your automobile’s age.

For instance, if you live in a region with a cold climate, you’d better opt for oil with a low viscosity grade. Meanwhile, high viscosity oils are more appropriate for driving in a hot climate or if you deal with racing or hauling heavy cargoes.

You can see the oil’s viscosity index on both the front and back of the bottle. Moreover, the oil specification and some other details can be found on the bottle back.


Things You Need to Keep in Mind While Buying High-Quality Synthetic Oil

Contemporary engines produce much more pressure than their predecessors twenty or thirty years ago. They are able to achieve a pressure of 10 tons per square centimetre. Thus, to cope with that pressure and keep your motor’s inner parts free from rubbing, you need to acquire efficient oil.

Additionally, some drivers forget when they change the oil the last time and often neglect maintenance pretty long. If you have no desire to spend extra money on your vehicle’s repairs, caused by poor oil or its improper servicing, always keep an eye on oil.

Nobody wants to change oil too frequently, but sometimes an automobile may require an oil change after a short period of time. Usually, it happens because of too hot or too cold weather as well as bad driving conditions.

Synthetic oil is a great solution if you want to refrain from a frequent oil change. It lasts longer than its conventional rivals, reducing the risk of any malfunctions. Moreover, it’s more efficient in greasing motor details and allowing them to operate smoothly without rubbing one another.

Note that by providing your motor oil with proper maintenance, you can save much money on repairs as we know that a skilled mechanic may take $200 just to diagnose the problem to tell nothing about any serious repairs.



We all know that by purchasing a car, we took a great responsibility. Clearly, when you buy a brand new car, you will face fewer problems and malfunctions. But even in this case, it’s important to preserve your motor’s good condition and contribute to its long life.

Actually, it’s easier to prevent any troubles than to solve them. Synthetic oil can be your best assistant in increasing the longevity of your engine. By getting enough lubrication, the motor’s inner parts won’t rub one another and thus, they became less prone to weariness. Consequently, the motor will function more smoothly, showing greater performance.

Last update on 2021-07-07 / Affiliate links / Images from Amazon Product Advertising API

Thomas Buck

Thomas is our expert in the field of motor oils and lubricants. He worked for more than 15 years at the dealer service station and has vast practical experience, so he gladly agreed to be the editor and co-author of our articles about motors and motor oils.

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