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We are going to make a comparison of two popular synthetic oils that you might be interested in purchasing. We will talk about the benefits and drawbacks.

They are loaded with everything you need to keep any motor lubricated. We will let you know whether these oils do these critical things to ensure you are getting your money’s worth. So, if you are interested in discovering whether Valvoline or Castrol comes out on top, keep reading.


What are the most popular Valvoline and Castrol brands of oil?

In the U.S., the most commonly used oils are 0w-20, 5w-20, and 5w-30. For high mileage cars, 10w-30 viscosity oils are most commonly used. Let’s take a look at these oils.

Best choice

Castrol Edge 0W-20 Advanced Full Synthetic Motor Oil

Castrol Edge 0W-20 fully synthetic engine oil, which is designed for modern engines, also used for heavy-duty vehicles and approved for use in sports cars. Recommended by such brands as Honda, Ford, Toyota, Mazda, Mitsubishi, Nissan, Subaru, Kia, Hyundai, Buick, Chevrolet, Cadillac, GMC.

  • 4,9 Rating
  • API: SP / SN PLUS / SN, ILSAC: GF-6, ACEA: A1 / B1, ACEA C5
  • GM 4718M, GM 6094M, WSS-M2C947-B1, WSS-M2C962-A1

Castrol Edge 0w-20

Castrol Edge 0w-20


  • API: SP / SN PLUS / SN, ILSAC: GF-6, ACEA: A1/B1, ACEA C5, GM Dexos 1, gen2
  • Superior performance against deposits, wear, and oxidation
  • Superior engine protection vs conventional and synthetic blend oils
  • Meets the needs of Honda, Toyota, Acura, Lexus, and other vehicles where the 0W-20 grade is recommended
  • 42 percent better rating on fighting power-robbing deposits

Valvoline Advanced 0w-20

Valvoline Advanced 0w-20

The product consists of a specially formulated Group IV oil stock base backed with special anti-wear additives. Not only do these help keep your engine running smoothly by providing minimal contact between moving parts, but the durable additives stay in the oil longer, giving your engine longer protection from wear and tear.


  • A powerful blend of additives provides long-lasting wear protection;
  • Highly efficient at dissolving and preventing sludge formation;
  • Reduces wear on engine parts by reducing friction;
  • Protects engine from seizing in cold weather;
  • Provides clean combustion, reduces fuel losses and engine emissions.
  • It may only be suitable for smaller vehicles.

Castrol Edge 5w30 full synthetic

Castrol Edge 5w30

Castrol Edge is engine oil that resists viscosity degradation better than other synthetic and conventional oils.
It has a drain interval of 15,000 miles with the ability to protect your engine between vehicle oil changes.
If you are under heavy-duty driving conditions or need oil for high-performance applications, this is the best oil to buy for that purpose.
It is recommended that you use this oil to its full potential; you should use Bosch oil filters.


  • Meets API SP/SN, ILSAC GF-6, and ACEA A5/B5, C2
  • Eliminates the formation of engine deposits for optimal engine response.
  • Compatible with Ford, Honda, and Chrysler.
  • Amazing acceleration.

Valvoline Advanced 5w-30

Valvoline 5w-30

It contains special seal care ingredients, anti-wear additives, additional detergent technology, and a range of antioxidants to promote long-term engine health. This proprietary formulation assists in decreasing oil leaks, sludge and poorly performing motors in high-mileage cars. The fact that this synthetic oil blend has an appealingly affordable price makes it an obvious winner in this category.


  • Meets API SP/SN, ILSAC GF-6A
  • Compatible with Ford and Chrysler.
  • Great performance for high mileage vehicles.
  • Helps prevent oil leaks, sludge, and more.
  • Excellent price.
  • Shorter change intervals, not recommended for vehicles with low mileage.

Castrol Edge 5w-20

Castrol Edge 5w-20

Castrol Extended Performance Advanced 5W-20 Full Synthetic Motor Oil is precisely what your motor needs to function steadily in varying conditions. This is from the giant, immensely loved global company Castrol, which is one of the dominant makers of synthetic oil.
Indeed, they produce some of the finest synthetic motor oils, thus making their oils a reliable option for car owners. Castrol EDGE is among them, and just what your car and motor require to perform flawlessly.


  • API: SP / SN PLUS / SN, ILSAC: GF-6, ACEA: A1/B1, ACEA C5, GM Dexos 1, gen2
  • Minimizes the contact between the metals while driving at various speeds.
  • Enhances fuel efficiency by decreasing the buildup of debris in the engine.
  • The fluid retention technology offers maximal resistance even when exposed to pressure.
  • Suggested for use under extreme driving situations like idling, towing, hauling, heavy-duty driving, and while driving in wet and muddy conditions.
  • Among the best synthetic 5w-20 engine oils on the market.
  • Decreased engine wear due to titanium additive.
  • Complaints about decreased fuel efficiency.

Valvoline Advanced 5w-20

Valvoline Advanced 5w-20.jpg

Valvoline is another brand that is synonymous with synthetic motor oils. Valvoline Synpower is exactly what you need to keep your engine clean and well maintained. Regular use of Valvoline SynPower will result in a cleaner engine, which in turn will result in excellent vehicle performance, faster engine ignition, and better parts running speed.


  • API: SP / SN PLUS / SN, ILSAC: GF-6A, GM Dexos 2
  • Optimal high-temperature protection in severe driving conditions.
  • Cold weather protection provides faster oil flow for quick starts in cold conditions.
  • Increases fuel efficiency and helps maintain it.
  • Meets the engine requirements of all turbochargers and superchargers in North America.
  • Keeps engines clean and well maintained.
  • Reduces sludge formation.
  • Oil change interval after 10,000 miles.
  • Reasonable price.
  • Complaints that bottle came with a broken seal and leaked oil.

Castrol Edge 10w-30

Castrol Edge 10w-30

Castrol EDGE High Mileage is part of the most powerful and progressive line of fully synthetic engine oils. It has been designed with fluid titanium technology to ensure superior engine oil strength and assist your vehicle to perform to its maximum potential. When your car gets old, your engine can suffer a loss of performance and effectiveness. Proper vehicle service is essential to help an older engine maintain its optimal performance.


  • API: SP / SN PLUS / SN, ILSAC: GF-6, ACEA: A1/B1
  • Titanium-strong for maximum engine performance in vehicles with more than 75,000 miles on them.
  • Maximizes short- and long-term engine performance in high-mileage engines.
  • Fortified with extra liquid titanium technology to increase oil film strength and reduce film degradation.
  • Reduces leakage, oil burn, and performance-degrading deposits.
  • Improves fuel economy.

Valvoline High Mileage 10W-30

Valvoline 10w-30


  • API: SP, ILSAC: GF-6A, Approvals: Chrysler MS-6395
  • Superior antioxidants resist motor oil breakdown in extreme conditions
  • Enhanced anti-wear additives
  • Added detergents help protect against sludge and deposits
  • Premium seal conditioners help treat and prevent leaks

Castrol Edge full synthetic oil

Castrol Edge 5w30 full synthetic

How often to change Castrol synthetic oil?

The great thing about Castrol Synthetic Oil is that it lasts up to six months or 15,000 miles. Note that this is for normal driving and not for severe driving conditions.
If you drive in severe conditions, the oil will last up to 3 months or 3,000 miles.
Changing your engine oil more frequently will benefit the life of your engine and help you identify potential problems with your vehicle.

Valvoline vs. Castrol: Which is better?

Now it’s time for the verdict. Is it the Castrol or the Valvoline which is superior?
Both have advantages and disadvantages and features that differentiate them from the other. After considering all the features and advantages, we decided that Castrol Edge is the better engine oil.
It is indeed the best long-lasting synthetic oil with special additives that increase the performance of your vehicle better than the competition. It’s also set at a reasonable price.

The next best thing is a classic, Valvoline. It’s been around since the 1800s and is still one of the leading manufacturers of motor oil.
We chose this oil in second place because it can improve the functionality of your engine and is great for lubricating the engine to reduce friction.
Another advantage is that it can offer better miles per gallon, but it still has nothing on Castrol Edge, which can meet the strict Dexos1

Castrol Magnatec vs Edge

In terms of engine oils, synthetic oils are indisputably the best option. Indeed, it has been a proven fact throughout the years. But what is actually difficult is to determine what kind of synthetic oils are the best. There is an ongoing debate between Castrol Magnatec VS Edge motor oil. Both are high-performance oils. Before you buy one, you can check below which is best suited to your vehicle.

Castrol Magnatec Castrol Edge
Significantly decreases engine wear Offers power under intense pressure
Provides a protective layer during warm-up and before Reduces metal-to-metal contact at various driving speeds
Makes critical engine components 4X smoother to operate Fluid Titanium Technology boosts the performance
Less distance coverage More durable ability
Meets Specifications: API SN Plus, ILSAC GF-5, GM dexos1 Gen 2, Ford WSS-M2C929-A, WSS-M2C946-B1 API SN, ILSAC GF-5, ACEA A1/B1, A5/B5, GM dexos1, Meets Ford WSS-M2C929-A, Ford WSS-M2C946-A, Honda HTO-06, Meets engine test requirements of Chrysler MS-6395
For best performance, comply with the manufacturer’s recommendations in the manual. For best performance, comply with the manufacturer’s recommendations in the manual.

Castrol Magnatec

Castrol Magnatec is the other name for unstoppable protection. Need non-stop protection right from the start? Choose this synthetic oil and rest assured. In today’s hectic driving conditions, this oil works like magic to dramatically reduce engine wear. Patented Dualock technology makes the unthinkable possible.
Dualock technology is the successful end result of the ultimate ten years of study by Castrol technologists. The study was conducted in partnership with one of the most prestigious universities. The Dualock is the first technology in the world that uses the combination of several protective molecules. The smart molecules are linked together and participate in creating a powerful force field for protection.

By using this high-quality synthetic oil, you can reduce both warm-ups and stop wear by 50%. Non-stop protection right from the start – that’s the slogan of this high-performance oil. And it lives up to every word of it. Wondering if it’s true or exaggerated? Use it yourself and form your own opinion.
As the name implies, Magnatec focuses on peak performance at startup, as oils drain when the vehicle is at a standstill. This can lead to wear as oils try to cover the critical part. That’s why this oil is designed to hug delicate engine components, protecting them from the start.
Featuring a base oil and additives, it outperforms other synthetic oils in formulation. The smart molecules are the creation of molybdenum, zinc, and phosphorus. This is the most suitable oil to have solid protection in all driving temperatures, styles, and conditions.

Castrol Edge

This is the latest engine oil from Castrol. Most of the leading car companies in the world recommend this high-performance synthetic oil. This high-quality oil is designed only for the users who value premium performance in their vehicles. Since this oil is developed with Fluid Titanium Technology, it shows different performance at different pressures.
When the pressure is high, there is more stress. More friction is generated as a result. To combat this added pressure and minimize friction, you need a high-performance oil like Castrol Edge. Fluid Titanium Technology provides friction reduction, significant potency, and firm performance.

It has been tested to fight against extreme pressure as it is equipped with the most advanced technology. So it is superior motor oil, without a doubt. In recent times, no other synthetic oil can compete with it in terms of strong performance. With the Titanium FST, it doubles the shift performance. Thus, it prevents damage to the oil layer. Also, the oil allows you to fight the highest pressure compared to other modern engine oils.

Try to use it one time for your vehicle and you will notice the difference. The manufacturers promise that you will get the most intense and efficient performance from your engine. Since the soluble titanium polymer works together with Fluid Strength Technology and they work together in the oil, what more do you need to have an incredible performance from your car engine?

Our monitoring

Castrol is a big and reliable name as an engine oil manufacturer. Both their Magnatec and Edge motor oils are industry-standard oils that offer smooth performance. While they are compared to each other, in some cases they are quite similar. But still, they are not exactly the same. Certainly, there are some distinguishing factors. Let’s try to explore them.

The first aims to warm up the wear-reducing technique, while the second focuses on friction reduction and high-pressure performance. Both are pretty good oils and serve for a fairly long period of time. But obviously, the Edge is the race winner in terms of longevity. Magnatec needs to be changed more quickly. If you use it, you can go about 10k miles. But with the Edge, you can go an additional 5 to 7 km.

As an overall engine oil, Castrol Edge is ahead of Magnatec because it meets the toughest standards in terms of performance.

Valvoline Full Synthetic oil

Valvoline Advanced Full Synthetic SAE 5W-20

Valvoline vs Castrol GTX

Valvoline MaxLife SAE 5W30

Valvoline is one of the few oil manufacturers that backs its high-mileage oil with a warranty. If your engine has less than 125,000 miles on it, you can register it in a program that gives you some

Valvoline MaxLife 5W30 warranty protection from the company provided you follow maintenance records and use only their oil.

Valvoline MaxLife SAE 5W30 – Utilizing the latest breakthroughs in distillation, this engine formulation is designed to address the issues faced by high mileage engines. This oil helps reduce friction, remove corrosive deposits, and helps prevent oil leaks.

Castrol GTX HM

Regardless of how well lubricated the inside of your engine is, metal components wear out, and internal seals dry and shrink over time, allowing oil to reach places where it burns or leaks.
It used to be common to use thicker oils as engines got older, but these formulations put extra strain on the oil pump and don’t reach all the paths to fully lubricate the engine. That means instead of fixing the problem, they can actually accelerate engine wear.

Contrary to popular belief, synthetic oil does not slip through these gaps more easily and burns faster than conventional oil. Synthetic and conventional oils of the same viscosity flow exactly the same. For high mileage engines, there is a better alternative to these two oils: semi-synthetic oil.

Castrol GTX HM not only works better in older engines, but it also sticks to parts longer and provides better protection when starting an engine after a long idle period. This makes it a good choice for older vehicles that are used only occasionally, such as vintage cars and winter beaters.

Our pick

Valvoline High Mileage oil is the most outstanding product on the market. This is an extraordinary oil blend designed for cars that have up to 75,000 miles. It revitalizes your engine and makes it work better than before. What we like is that it helps decrease the appearance of wear and tear in addition to leaks, due to its seal conditioners. One other thing we also like is that this high mileage oil stops the engine from becoming clogged, due to the antioxidants in its formula. The antioxidants also do a great job of preventing deposits that can be harmful to your engine.

Castrol edge vs Castrol edge professional

The main difference between Edge Pro and Standard Edge is that the Pro version has a special dye mixed in that reacts to UV light, making it easier to diagnose oil leaks.


There are a variety of considerations when choosing the best oil.
We recommend trying both to find out for yourself which one you like better, but we guarantee Castrol Edge will win you over. Don’t fall for the lower price of conventional oils, because you get exactly what you pay for.
It’s worth the investment in synthetic oil to avoid engine problems and the associated costs later on.

Castrol EDGE Technology - Video


For how many miles will Valvoline full synthetic oil hold up?

We suggest changing Valvoline synthetic oil once every 3,000 to 4,000 miles. In heavy driving situations, however, you may want to replace it in intervals of 3,000 to 3,750 miles.
This applies to approximately 80% of users driving in heavy conditions.
Under regular driving conditions, replace your Valvoline oil at up to 6,000 miles. Do not exceed 6,000 miles or your motor may not be able to recover.

Is Castrol Edge fully synthetic?

Yes. Castrol Edge is a fully synthetic oil designed for high-performance and prestige engines.
It helps maximize the performance of your engine in the short and long term.
It provides excellent protection for all driving conditions and temperatures.
Able to decrease friction up to 15%, its performance is 45% more powerful compared to the majority of motor oils.

Is synthetic oil really better?

This man-made oil is made from base oil, powder additives, and carrier oil that promotes even distribution of additives. It starts with highly refined crude oil that is pumped from the deep, similar to conventional oil. What differentiates conventional oil and synthetic oil is the level of refining they undergo. The reason synthetic oil is better than conventional oil is because of the way it is made and how your car performs after it is used in the engine. The performance of your car will be increased by 47% compared to conventional engine oil. Not to mention, synthetic oil has many advantages, such as: Lower emissions. Increased engine protection and wear due to less friction. Better fuel and oil consumption. Oil efficiency, as the quality is more predictable and consistent. Lower engine resistance due to a higher resistance to thickening. Faster engine start. Better protection in all weather conditions. Helps clean engine sludge and deposits.

David Muench (Carnes Mechanical)

David Muench (Carnes Mechanical)

Hey, I’m David. I’ve worked in a cars store for 6 years. I write reviews and guides, helping people to choose the most suitable technicals and best product for them. I’m happy to finally share my knowledge of the industry here, on CarnesMechanical.

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