Castrol Edge vs Mobil 1 Extended Performance Motor Oil

Castrol Edge and Mobil 1 extended performance are motor oils that belong to well-reputed companies that have been running for over a century. In fact, both the oils belong to companies that own the largest petrol corporations across the world.

Castrol is a company based in the United Kingdom and Mobil is a New York-based company that has been producing and selling engine oils for over a century.

As a buyer, you would often prefer the best and most trustworthy product out in the market especially when it comes to the engine oils of your cars.

Yes, this is one reason why oils like Castrol Edge and Mobil 1 extended performance are among the oils that are mostly bought by consumers.

Starting things with their Viscosity?

Engine oils are available in different grade viscosities which make the oil suitable for different weather conditions. The viscosity index improvers in the oils help the oil to give a maximum performance under different temperatures.

Castrol Edge motor oil

Moreover, both Castrol Edge and Mobil 1 extended performance oils meet and exceed the required ILSAC standards and are in the ILSAC-GF-6 category.

This makes the oils be environmentally friendly, have better fuel economy, increase the life of the engine, and reduce any carbon deposits or emissions.


Furthermore, there is a specific code mentioned on every oil bottle, for example, XXW-YY, in here, the X is the oil viscosity or grade at engine start-up, W indicates the winter, and Y indicates the grade at normal temperature when the engine is running.

Castrol Edge oil comes in 6 different combinations of grades which are 0W-20, 5W-20, 5W-30, 5W-50, 10W-30 and 10W-40.

Moreover, the 0W-20, 5W-20, 5W-30, and 5W-50 combinations of grades of oil are usually preferred to be used in colder temperatures whereas the 10W-30 viscosity grade is used under higher temperatures.

Mobil 1 external performance oil is also available in three grade combinations which are 0W-20, 5W-20, and 5W-30. The grade combinations of this oil are usually recommended to be used under low temperatures.

Oil Type Comparison:

Castrol Edge is the premium oil of the Castrol brand. It performs the best compared to the rest of the Castrol oils. Likewise, Mobil 1 is also the premium oil of its brand. Castrol Edge and Mobil 1extended performance are full synthetic oils.

Synthetic oils have been the hot topic of the market for a while now. This oil is actually better than the rest of the oil types available such as conventional oil, semi-synthetic oil, and high mileage oil.

Synthetic oils are properly made in the laboratory and are known to be the most refined form of oil. They perform better than the other oils as they work great under any weather condition.

When it comes to its viscosity, synthetic oils show high resistance which is another perk of it. Along with this, it also shows great resistance to thermal breakdown, oil sludge issues, and oxidation.

Moreover, they keep the engine safe and provide smooth running which gives it a longer performance life. So, even if they might be expensive to buy, the cost is actually worth it as you would not have to change the oil for a longer period of time.

Also, if you are an environment lover, then again synthetic oil is what you would want to get as it releases the least emissions compared to any other oil.

Thus, in this case since both Castrol Edge and Mobil 1 extended performance are synthetic oils, they both are equally reliable and trustworthy.

Castrol vs Mobil 1 Additives:

A couple of additives are added to synthetic oils for maximum and long-lasting performance. Since Castrol Edge and Mobil 1 extended performance are both full synthetic oils, that is why they have a similar mixture of blends in their oils.

The oil includes additives such as anti-oxidants, rust and corrosion inhibitors, viscosity index improvers, anti-wear agents, and detergents.

Comparing Castrol and Mobil 1 Engine Performance:

Catalytic converter performance

Catalytic converter failure is one of the most common and also the most expensive problems you might face when you buy oil. Since Castrol Edge and Mobil 1 extended performance are both full synthetic oils, you might be worried about their catalytic converter performance.

Well, on a good note, Castrol Edge oil is made up using fluid titanium technology and also phosphorous replacement technology. This innovative technology helps prevent any catalytic converter failure by reducing the level of phosphorous and boosts longer-lasting performance.

Moreover, Mobil 1 extended performance is also an advanced full synthetic oil that is made using modern technologies and additives that help control overheating of the engine and the emission of harmful by-products which may cause any fault in the catalytic converter. The oil is made up of the Emission System Protection (ESP) technology which helps maintain the catalytic converter performance.

Reduction of Sludge built

Sludge built up can cause many issues in the engine and eventually damage it or due to it you might have to change your engine oil way too frequently.

Oxidation is one of the causes of this and is more likely to happen under high temperatures especially when the engine stays heated up for a long time. This causes the oil particles to break and merge with dirt to form carbon which eventually turns in to sludge.

Full synthetic oils like Castrol Edge and Mobil 1 particularly focus on how such issues can be avoided as these oils are purely made in laboratories and have the advantage of adding and mixing chemicals to ensure such issues are sorted out.

Castrol edge and Mobil 1 extended performance, both have anti-oxidants and rust and corrosion inhibitors added into their motor oils. The anti-oxidants are used to specifically slow down or stop the oxidation to take place under high temperatures.

Thus, they protect the engine oil. The rust and corrosion inhibitors further help to stop any sludge built up by preventing any reaction to happen between the metal surfaces and moisture.

Oil burn-off Protection

When your engine heats up, it causes the oil particles to eventually evaporate which results in the reduction of oil and you will have to change the oil earlier than normal. Thus, increased oil burn-off would result in more fuel consumption.

This is an important aspect to consider when you buy an engine oil. Luckily, Castrol Edge and Mobil 1 extended performance are oils made with great focus and care, taking into consideration the oil burn-off protection.

Particularly, the titanium technology in Castrol Edge oil helps reduce any oil burn off. Moreover, there are other additives present in the oil which help control and oil particles from evaporating when the engine heats up.

Furthermore, the modern technology used in Mobil 1 extended performance oil also helps limit any oil vaporization under high temperatures. Along with this, the viscosity index inhibitors present in the oil allow the oil to remain stable under different temperatures and thus the fuel consumption of the oil is controlled.

Minimizing Engine Wear off

Castrol Edge and Mobil 1 extended performance are premium oils that are made up of unique compounds that promote anti-wear properties.

Specifically talking about Castrol Edge, the oil is known for its cleaning properties. The oil is made up of anti-wear agents that help in reducing the wear that is produced due to the friction between the metal surfaces. Along with promoting low wear, the oil also gives a longer-lasting performance.

Moreover, Mobil 1 extended performance also has anti-wear agents that minimizes engine wear off. In fact, it is known to be the best lubricant for your vehicle’s engine and provides it with good protection.

All the chemicals used in making anti-wear agents in both these engine oils include phosphorous along with having the most important substance which is zinc dialkyldithiophosphate (ZDDP) in the oil.

Engine Seals Protection

The additives added into full synthetic oils helps protect the engine seals from any wear or tear. Such detergents are added in both Castrol Edge and Mobil 1 extended performance oils. These detergents maintain and protect the metal surfaces and engine especially when it overheats.

Moreover, the additives in the oil help absorb and contain important substances which limit any damage to the engine. This also includes the limiting of any sludge built up and acids production that might damage the engine.

Improved Fuel Economy

Fuel consumption can be slowed down if the engine oil is made up of additives that promote less wear, reduces friction, and keeps the engine clean and free from issues such as sludge built up and oil burn-off protection.

Castrol Edge has good fuel economy since its friction of the fluid is low especially in 0W-16 grade. The titanium technology and the anti-wear additives used in the oil promote optimum performance, reduces wear, and helps in running at least 140 hours longer.

Mobil 1extended performance also has good fuel economy as it has engine preservation qualities that boost performance along with keeping the car’s maintenance to help the oil work for longer. The anti-wear additives in the oil further help in lowering friction and wear.

Mobil 1 extended performance meets the requirement of the ILSAC standard. The motor oil category under which the Mobil 1 extended performance is the ILSAC-GF-6A. This is the latest standard by the ILSAC committee which aims in improving fuel economy.

Castrol Edge and Mobil 1 both have equally good fuel economy as both the oils have substances and additives in them that promote maximum performance along with preserving the oil for long enough.

Oil Change Frequency:

Seeing the mileage of the motor oils you buy is an important aspect to consider before you get them. You would not prefer oil for your engine that wears off quickly and does not cover enough miles before it has to be changed again. That would be a waste of money. Luckily, Castrol edge and Mobil 1 are well-known oils that last pretty long before they have to be changed.

Castrol Edge uses titanium technology which gives it an edge to perform well and reduces its wear. The vehicles can perform well up to 15, 000 miles before it needs an oil change.

Thus, Castrol edge is a great oil that maintains the engine’s life and maximizes performance by reducing any carbon deposits on the engine. Moreover, Castrol edge has substances and detergents in its oil which are known for their cleaning properties.

Mobil 1 extended performance has excellent mileage that helps the oil last for long. The oil guarantees to work over 20, 000 miles before it requires to be changed. Moreover, the substance used in the oil helps to increase the life of the vehicle by about 75,000 miles or more.

Thus, when it comes to its mileage and oil change frequency, Mobil 1 extended performance wins over Castrol edge as it works for longer before the oil needs to be changed.

Cost Comparison:

When it comes to its price, Castrol Edge and Mobil 1 both are premium oils and you might think they would be pretty expensive and out of budget. However, that is definitely not the case! The oils are not cheap but can be easily affordable by most motorists.

Castrol edge costs you around $22 and Mobil 1 costs you around $31 but of course, the price could vary depending upon where you buy it from.

Stating that, Castrol Edge takes advantage of Mobil 1 in the price aspect.


Castrol Edge and Mobil 1 extended performance are both well-known premium oils that have among the largest oil companies in the world. Being full synthetic oils, they share a lot of similarities such as having multi-grade viscosity, high mileage, and better fluidity even in cold weather conditions due to which it gets even harder to compare and choose which oil is the best among the two.

Castrol Edge oil uses titanium in it that helps give you a smooth driving experience whereas Mobil 1 extended performance is a great oil that gives you excellent performance under extreme weather conditions. So, whichever oil you choose and buy among these two, it would not be a bad choice as they both perform great and are worth it.