Amsoil vs. Redline Motor Oil: Detailed Comparison

Synthetic engine oils are nowadays preferred more than conventional engine oils. Synthetic motor oils are more efficient and convenient as well. In this industry, you will hear a lot of brand names. But, you must listen to the most significant controversy, Amsoil vs. Redline Motor Oil.

These two gear oils compete as they are both outstanding oils. These oils are used in passenger cars, light trucks, tractors, marine applications, and performance vehicles. The two oils have gone through many tests and shown significant differences.

Here you will get the details of how both the oils work and what makes each of them unique. So, without further delay, let’s get into the details.

Comparison Chart – Amsoil vs. Redline Motor Oil:

Amsoil Motor OilRedline Motor Oil
Maintains the best flow at cold temperatureProvides best oil flow at high temperature
Increased base number(13) than RedlineLow base number(10) than Amsoil
Cold Cranking Viscosity 3700Cold Cranking Viscosity 6400
It doesn’t allow to create much deposit in oxidationMore deposit is formed in the oxidation
Evaporation is higher in hot temperatureEvaporation is minimal in hot temperature  
Resists Corrosion by creating an iron-sulfide barrier layer on the gear surfacePrevents Friction and Corrosion well
Added additives keep the oil fresh and engine smoothAdded detergent additives clean the inside
Expensive than RedlineCheaper than Amsoil

In-depth Discussion – Amsoil vs. Redline Motor Oil:

You can see a quick view of the two brand motor oil specifications from the comparison chart above. Now, let’s figure out the details.

Pour Test

Pour test of motor oil defines the viscosity or thickness of the oil. It is essential to know the oil you choose and how thick or thin it is. Because this will decide the oil flow quality in your engine and the overall performance.

Amsoil and Redline have gone through several lab tests again and again. Both standard pour test and cold pour test were performed. The results showed Amsoil takes less time to flow through in both tests, and Redline takes more time.

This means Amsoil is a much thinner oil than Redline. And thinner oil runs fast through the engine and keeps the engine working great. Even in cold weather, the flow rate doesn’t decrease that much in Amsoil. So, you get a better cold start and a smooth operation.

On the other hand, we have Redline. Redline works fine in average temperature with its thickness. But in cold temperatures, the oil struggles to flow frequently. So, it is not suitable to use in cold weather.

Base Number Comparison

Different gear lubricants are made with a lot of chemical components. So, the chemical reactions form acid in the suspension, which is necessary. Like other lubes, Amsoil and Redline have the same.

But, at a certain point, the oil should maintain the ratio of chemical reactions. So, a marking system is made for this by performing different tests. This is called the base number. The base number determines the Alkalinity regaining capability of a lubricant.

Amsoil has a base number of 13 in this case. In contrast, Redline has a base number of 10. So, you can see Amsoil has a higher base number. But, what does the base number say about motor oil?

Corrosion and Friction Resistance

The base number we talked about in the previous point has undoubtedly to do something with Corrosion. The higher the base number of oil, the better it can prevent Corrosion. So, we already understood that Amsoil is better at avoiding Corrosion.

Let’s talk about wear and friction now. An engine is designed very compactly for ease of use inside a vehicle. So, the metal parts are very close with =one another inside. When the elements create metal-to-metal contact, wear and friction occur.

So, you need oil to prevent the metal-to-metal contact, so the engine doesn’t ruin. Both Amsoil and Redline motor oil are formulated in a viscosity that prevents wear and friction. But, being a thicker oil, Redline does the work more efficiently. Because the oil’s consistency does not let the metal parts contact each other.

Evaporation Test and Oxidation

In hot temperatures, there are two tests performed. One is the evaporation test, and the other is the oxidation test. These two tests aim to see how the engine oil works at high temperatures.

The evaporation test determines how much of the oil evaporates while running. It also talks about the fuel economy of the oil. The oxidation test shows if the oil produces deposits in high-temperature operation.

The results showed that Amsoil evaporates more at hot temperatures in the test. That means you need to input oil more frequently. So, it will cost you more. On the other side, Redline evaporates less. That means it has increased fuel economy, and you do not need to input oil frequently.

In the Thermal-Oxidation test, Amsoil resulted in creating less deposit. On the contrary, Redline makes more deposits. So, Amsoil again took over Redline.

Price Comparison

Redline comes cheaper than Amsoil. Here another fact is, Amsoil has been in the business for more time than Redline. So, the engineers create their oils more efficiently as the experience shows up in the production. That is why their oils are costlier than many other brands.

Redline is more convenient to price, but it does not mean it is cheap material. The engine oil also works fine for your engine. But if you run a heavy vehicle that has to deal with the excessive load, Redline may not be the choice then.

Amsoil or Redline Motor Oil – Which one to choose?

As Amsoil and Redline have created versus situation, they have something significant to compete with each other. So, choosing one from the above becomes a little critical.

But, you can differentiate them by many terms and factors. If you want a refined oil that can work excellent both for your hot and cold temperature driving, you must go for Amsoil. Again, only if you are ready to put some extra bucks for it.

If you are looking for a good-to-go oil, especially for your hot temperature driving, then Redline is the choice. It stays stable at high temperatures and resists oxidation in your engine. So, it is beneficial for you.


What is better, Amsoil or Redline?

-Both Amsoil and Redline are fantastic oils. But, according to different practical tests, Amsoil is the better one.

Is Redline the best oil?

-Redline is good oil. It is a standard oil that gives tough competition to other renowned motor oils like Amsoil, Mobile 1, and Pennzoil.

Is Amsoil the best oil?

-Amsoil is a fully synthetic oil that provides the ultimate gear protection and better engine performance. Amsoil has always resulted better in many ways compared to many other oils. So, you can consider this oil to be one of the best motor oil available in the market.

Final Words

Now, we have come to the end of the Amsoil vs. Redline Motor Oil discussion. Hope that you will be able to choose one now.

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