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Best 5W30 Fully Synthetic Oil Review and Guide for 2018

best 5w30 fully synthetic oil

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Are you confused by all those products claiming to be the best 5W30 fully synthetic oil? Then our reviews may be able to help you decide which is best for your car. Our 2017 guide will also explain about 5W-30 in general and what differentiates it from other oils.

Quick Look: Our Top Picks

Motor Oil NameQualityPriceRating
Mobil 1 94001 5W-30 Synthetic Motor OilA++$$$
Castrol 03084 Edge 5W-30 Synthetic Motor OilA+$$
Pennzoil 550038221 Platinum 5W-30 Full Synthetic Motor OilA++$$
Valvoline SynPower Full Synthetic Motor OilA$
MAG1 61790-pk6 Full Synthetic 5W-30 SM Motor OilA+$

What is 5W-30 Motor Oil?

This short video explains what 5W-30 oil is. Basically, those numbers and letters on motor oil – 5W-30 in this case – mean the oil has two viscosity grades. Most car oils are multi-grade, so you don’t have to use thick oil in the summer and thin oil in winter. With multi-grade oil, the old routine is no longer necessary.

In the case of 5W-30, the W stands for winter. The lower the number next to the W, the better the oil performs during cold starts or winter. The number after the dash – 30 in this case – signifies the oil has to be at certain restrictions at 100 C. A low number indicates the thinness of the oil, so lower number = thinner oil. Your vehicle’s owner’s manual will state what specs are suitable.

Why Should I Use 5W-30 Motor Oil?

5W-30 is made up of special blends that fortify, clean and improve engine performance. The 5W-30 grade is also suitable for most cars because it provides engine protection without compromising performance.

5W-30 grade motor oil prevents sludge and other engine deposits so it lasts longer. In addition, the oil cleans the engine so it doesn’t make a lot of noise. These oils also provide lubrication to keep the engine running. The formula varies however, which is why you have to choose carefully.

5W-30 also keeps oxidation and thermal levels stable. 5W-30 oil also provides optimum performance, even in-between oil changes. This means your car doesn’t deteriorate, so you get the most out of the engine. Other benefits of 5W-30 are superior frictional properties and better fuel mileage.

There are other benefits to using 5W-30. It is compatible with turbo charged, diesel, gas, and multi-valve engines. In short, 5W-30 works with most vehicles sold today and even older models.

How to Choose 5W-30 Oil

Even if you have narrowed the choice down to what your owner’s manual suggests, there are still a lot of factors to consider.

  • Additives: additives are used to keep the engine free of rust, corrosion, smudge, and deposits. They’re also necessary to cool down components.
  • Viscosity Ratings: all cars today work with multi-viscosity oil. The rule of thumb is the lower the number the smoother the flow, but you have to consider how and where you drive too.

There are other factors that you need to consider before buying motor oil. The following are the most important ones.

  • If you have been using conventional oil and your engine is no longer running well, it may be time to try 5W-30. If you are using 5W-30 and feel like you’re not getting maximum mileage, maybe it’s time to try another brand.
  • Does your owner’s manual say you have to use a specific type of oil? Use only what is recommended, especially if it is still under warranty. Using something other than that could void the warranty.
  • If you’re going to use 5W-30, make sure that it is suitable for the climate. If you frequently traverse mountainous areas or hot or very cold locations, multi-weight oils like 5W-30 is ideal.

Because of the benefits that 5W-30 provides, a lot of those with older cars now want to make the switch from conventional oil. It is possible to do this, but keep in mind that your old engine will have a lot of sludge and deposits in it. If you suddenly opt for a 5W-30 with detergent, it’s going to release all the dirt. You also have to consider the state of your engine. While 5W-30 can help, it can only go as far to help the state of your engine.

5 Best 5W-30 Synthetic Motor Oil

Motor Oil NameQualityPriceRating
Mobil 1 94001 5W-30 Synthetic Motor OilA++$$$
Castrol 03084 Edge 5W-30 Synthetic Motor OilA+$$
Pennzoil 550038221 Platinum 5W-30 Full Synthetic Motor OilA++$$
Valvoline SynPower Full Synthetic Motor OilA$
MAG1 61790-pk6 Full Synthetic 5W-30 SM Motor OilA+$

Mobil 1 94001 5W-30 Synthetic Motor Oil

Mobil 1 94001 5W-30 Synthetic Motor Oil-5be9f64f9cdf3

The Mobil 1 94001 formula provides engine protection all season long, and it matches the needs of vehicles that use diesel. The oil is also compatible with modern vehicles, including those with multi-valve fuel injected, supercharged gasoline and turbo-charged engines. In short, the formula works for trucks, light vans, and cars.

The Mobil 1 94001 5W-30 motor oil keeps engines running in good condition. Regular use also keeps your engine from wearing out. It also keeps your engine clean, which results in smoother, quieter performance. The viscosity level is the type that’s recommended for GM cars and other imported vehicles. The formula also contains Mobil 1’s proprietary formula for optimum performance.


  • Provides excellent protection against engine deposits
  • Reduces sludge formation
  • Offers superior performance at high and low temperatures


  • Very old engines may not benefit as much

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Castrol 03084 Edge 5W-30 Synthetic Motor Oil

Castrol 03084 Edge 5W-30 Synthetic Motor Oil-5be9f6512db83

The Edge 5W-30 motor oil provides the essential elements to keep your engine running as it provides you with 42% more power to get rid of engine deposits. The formula also offers maximum engine protection, even when you drive in difficult environments. The proprietary oil also helps the engine run better.

With regular use of the 5W-30, your engine is able to cope with the demands of operating in high temperatures. The oil also means the most critical engine components get the maximum level of protection, regardless of running temperature.

The formula also contains proprietary elements that prevent engine instability. This motor oil is compatible with popular passenger cars and other vehicles, and regular use cuts down engine noise and other potential problems.


  • Meets the highest standards for synthetic motor oil
  • Improves engine performance
  • Increases engine mileage


  • More compatible with newer engines

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Pennzoil 550038221 Platinum 5W-30 Full Synthetic Motor Oil

Pennzoil 550038221 Platinum 5W-30 Full Synthetic Motor Oil-5be9f65347cf1

The Pennzoil SW-30 is a full synthetic oil which eliminates engine sludge, resulting in better performance. The SW-30 comes with superior active cleaning agents, so it cleans engines much better than other synthetic SW-30 oil sold today.

The proprietary formula gives the engine strength necessary to cope with difficult driving conditions. Furthermore, the formula matches or goes beyond the needs of most vehicles. The Platinum motor oil also keeps oil deposits from building up, even with rigorous use.

Because the Pennzoil Platinum does a good job of cleaning oil, your engine runs quietly. It is also cost effective as a single change is good for up to 5,000 miles or more, depending on how you drive your car.


  • Exceeds industry performance standards
  • Cuts down engine wear
  • Increases engine life span


  • Extra amounts needed if your car has been using conventional oil

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Valvoline SynPower Full Synthetic Motor Oil

Valvoline SynPower Full Synthetic Motor Oil-5be9f654d9e5f

The Valvoline SynPower Full Synthetic Motor Oil focuses on three areas to defeat engine stress: wear, deposits, and heat. Running engines in very cold or very hot climates forces engines to work harder, which leads to engine breakdown. What SynPower does is fortify your engine so it can withstand extreme temperatures.

SynPower also contains custom anti-wear additives. These additives remain in the oil for better protection. Compatible with a wide array of cars and other vehicles, the special formula also goes far in terms of improving fuel efficiency.

Valvoline products are known for their efficiency, and that is evident with SynPower as it works with supercharged, turbocharged, and naturally aspirated vehicles. Changing every 4,000 to 5,000 miles produces great results.


  • Varnish protection is top notch
  • Improves fuel efficiency
  • Compatible with all popular cars used in the US


  • You may need to use more oil for very old cars

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MAG1 61790-pk6 Full Synthetic 5W-30 SM Motor Oil

MAG1 61790-pk6 Full Synthetic 5W-30 SM Motor Oil-5be9f6563ea22

The MAGI 61790-pk6 Full Synthetic Motor Oil contains special amounts of FMX friction modifiers so the engine will last longer. The oil cuts down wear and tear by up to 56%. The MAGI also has High Phos Retention 2DP, and this reduces wear while improving performance.

Its viscosity level is superior to other 5W30, leading to greater fuel economy. With its SAE 5W-30 rating, it means the MAGI motor oil has a rating of 30 in normal operating temperatures and 5 in cold weather, underscoring its versatility. The bottle design is another plus, as it simplifies pouring.


  • Reduces engine wear up to 50% more compared to regular synthetic oil
  • Complies with ILSAC GF-5 and API SN
  • Gives engine more resistance to cold starts


  • Changing from conventional to the MAGI may cause leaks if not done properly

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Our Recommendation

If you’re looking for best 5w30 fully synthetic oil, the products above would fit the bill, but if we had to pick a winner, it’s the MobilMobil-1 5W-30. There’s a reason why Mobil-1 is the preferred choice of high-performance drivers, and it is evident here.

This 5W-30 motor oil does what it’s supposed to without difficulty. It is easy to use, you don’t need frequent changes to make it work, and wear protection is top of the line. There are times when ads don’t match the product, but with Mobil 1, you get the performance boost promised.