7 Best Synthetic Motor Oil in 2021 [Reviewed]

Best Synthetic Motor Oils
So I hope you agree with me when I say:

 A good engine oil can breathe new life in a car 

If you want to keep your vehicle running smoothly in cold and hot weather conditions then synthetic motor oil is your perfect choice. In contrast to regular motor oils, synthetic oils do a much better job at keeping your engine and its components lubricated for a long period of time. With the right synthetic oil, keeping your vehicle running in peak condition can become a very easy task.

Finding the most useful synthetic motor oil for your car could require lots of comparison and research due to the market being filled with a variety of engine oils. So to make your job easy our team of researchers performed multiple comparisons, reviewed dozens of synthetic motor oils and tested them on multiple scales including how well they performed in cleaning tests, cost, and other considerations to make sure you can find the best synthetic motor oil for your car.

Moreover, I have also included guides on “Importance of Strong Oil” and “ Comparison Between Full Synthetic and Synthetic Blend” for further knowledge.

Best Synthetic Motor Oil in 2021

Here are our top picks for the perfect synthetic motor oil Money Can Buy:

Synthetic OilsRatingPrice
Royal Purple 51530 Synthetic Motor Oil 
10/10(Editor's Choice)
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Valvoline SynPower Full Synthetic Engine Oil 9/10
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Mobil  Super 3000 5W-30 9/10
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Castrol EDGE 5W-30 8/10
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Shell Rotella T6 Full Synthetic Diesel Engine Oil 8/10
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Pennzoil Platinum Full Synthetic Motor Oil9/10
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Liqui Moly Synthoil Premium 7/10
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1) Royal Purple 51530 Synthetic Motor Oil 

Why we recommend it?

  • Good wear protection
  • Compatible with Ethanol related fuels
  • Provides great corrosion protection

API-LicensedNot for high internal combustion engines
Protection from catalytic emissions
Increased fuel efficiency
Superior corrosion protection

Royal Purple is a Texas based company with over 200 years of experience with lubricants. Their synthetic based oil combines quality base oils with proprietary technology to produce motor oil that optimize engine performance to its optimum amount.


2) Valvoline SynPower Full Synthetic Engine Oil 

Why we recommend it?

Anti wear protectionnone(virtually)
Longer mileage
Cold resistant

Valvoline has invented their motor oil 150 years ago, and has been reinventing great oil ever since. The Valvoline family of premium motor oils have formulas perfect for your vehicle needs.

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3) Mobil  Super 3000 Full Synthetic Oil

Why we recommend it?

  • Great cold start-up performance
  • Sludge protection
  • Low viscosity motor oil

ReliableContains sensitizing substances
EfficientContains C14-16-18 Alkylphenol
Keeps engine clean

Mobil Super™’s premium motor oil line offers proven protection to help extend engine life. The company focuses on the protection of sludge and engine wear through their motor oils.

4) Castrol EDGE Synthetic Oil

Why we recommend it?

  • Uses a full synthetic blend
  • Great engine protection
  • Lowers friction and maximizes engine performance

Strong filmsA bit pricey
Very good engine protection
Reduces friction to zero

Castrol is a British global brand of industrial and automotive lubricants. The company focuses on Liquid engineering to produce high quality oils.

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5) Shell Rotella T6 Full Synthetic Diesel Engine Oil

Why we recommend it?

Improved Deposit ControlOnly certified for diesel engines
Emissions System Compatibility
Outstanding Shear Stability

Shell is a US based global company using their decades worth of research and knowledge to keep improving their lubricants as much as they can.

6) Pennzoil Platinum Full Synthetic Motor Oil

Why we recommend it?

  • Oxidation stability
  • Fully synthetic
  • Made from natural gas

Helps protect engines from horsepower lossFuel economy  improvement not too great
Good fuel economy
Wear protection

Pennzoil is an American oil company based from Los Angeles. When it comes to keeping engines lubricated, nothing beats Pennzoil.  It was also the first oil company to base their motor oil from Natural gas.

7) Liqui Moly Synthoil Premium

Why we recommend it?

  • High lubrication reliability
  • Cleaning agents
  • Fully synthetic

Temperature resistantLimited viscosity grades
High lubrication

Made in Germany, Liqui Moly Synthoil Premium is a favorite among European automotive owners. Their main product line is with MoS2 that enhances the lubrication quality of the oil and offers emergency operating features under harsh conditions.


The above list was made after the combined effort of the consumers and our research team. While the list contains oils for everyone, it is advisable to choose the one most fitting for your car rather than going for the one with the most features. Taking care of a vehicle by using quality oil will also save money in the long run, even if the care can get costly it would still be advised since a well kept vehicle would need fewer repairs and a hassle-free experience

More Information

Why is a Strong Oil Important?

Today’s engines are smaller and more efficient, without sacrificing performance. These advances in the design of engine challenge the oil with increased pressure. To withstand this, oils need to be stronger than ever before

During every engine revolution, intense friction hotspots occur. Flashing into existence for a matter of micro-seconds, they continually move round the engine because it delivers power. Collectively, these friction hotspots can waste more than 10% of total engine performance.

Under such pressures, the sole thing standing between metal surfaces is that the oil. That’s why your oil needs to be strong .

Difference Between Synthetic Blend and Full Synthetic Oil

The difference between synthetic blend and full synthetic oil is that full synthetic is made with 100% synthetic material, whereas synthetic blend uses a mix of both conventional and synthetic oils. Blends offer better performance than conventional oils, but don’t cost as much as a full synthetic. It is also important to keep in mind that a synthetic blend won’t last as long as a pure synthetic oil.

Source: Motor oil condition evaluation