AMSOIL vs. Mobil 1: Battle of the Heavyweights


Comparing AMSOIL Signature Series and Mobil 1 Motor Oils

 Adding performance enhancing modifications to a vehicle is a popular choice for many enthusiasts. This may include turbocharging, supercharging, among other modifications. While these mods can make your car faster, they often neglect to mention the importance of motor oil protection from the additional power generated. Two of the best quality motor oils are AMSOIL Signature Series and Mobil 1. Let's take a deeper look into what each can offer in terms of protection and performance.


When adding horsepower to your engine, it is critical to consider the quality of motor oil needed to protect and support the additional pressure. If not upgraded, an oil film thinner than a sheet of paper could be insufficient. AMSOIL Signature Series synthetic motor oil motor oils are trusted by enthusiasts everywhere for their proven protection and effectiveness in high-performance engines. Make sure your engine is equipped with high-quality motor oil so it can handle all that power!

Clean muscle car engine.

What is The Shear Importance of Oil?

Shear plays a critical role in the importance of oil. High shearing forces can cause viscosity loss, which then adversely affects oil performance. This often occurs when one layer of the oil moves in a direction that is opposite of another layer, such as between a piston and cylinder wall. Engines operating at high horsepower levels and higher RPMs increase this risk, highlighting the need for using adequately viscous oils at these conditions to increase longevity and decrease engine wear.

The importance of oil’s ability to resist shear cannot be overemphasized. Shearing forces cause the molecules in the oil's additional ingredients to break down, which can reduce the viscosity range of the base oil. The type and amount of viscosity enhancers necessary varies depending on both the oil and its intended application; some synthetic oils don't even need any additional viscosity enhancers as they are naturally able to stand up to shear. The consequences of inadequate protection from shear-induced loss of viscosity are immense - without sufficient lubrication between two moving parts, there is a high risk that components may become damaged due to friction or excessive heat.

Shear is the movement of a fluid layer in an opposite direction than another layer of the same fluid. The distinct difference in motion between the two layers creates a force that can be used to aid in urban drainage systems and more.
Shear is the movement of a fluid layer in an opposite direction than another layer of the same fluid. The distinct difference in motion between the two layers creates a force that can be used to aid in urban drainage systems and more.

AMSOIL vs. Mobil 1

AMSOIL synthetic motor oil utilizes naturally resilient base oils as well as high-grade shear-resistant viscosity improvers that can handle extreme temperature and pressure. This combination exceeds the industry standards and outperforms Mobil 1 regarding preventing viscosity breakdown. When oil loses its viscosity due to shear, it fails to protect moving parts located between the piston, rod and crank. Therefore, AMSOIL is specifically developed with this type of usage in mind, providing maximum protection against such forces.

Volatility and Cleanliness

High engine performance requires a combination of cleanliness and volatility. Volatility measures an oil's tendency to turn to vapor in the presence of extreme heat, while cleanliness accounts for its ability to protect against the build-up of harmful engine deposits. Modified forced-induction engines create intense heat and require higher levels of volatility and total base number (TBN), which is a measure of an oil's acid neutralization capability. Ultimately, investing in the right blend of cleaner, more volatile oils ensures greater efficiency and longer life for your dream vehicle.

Signature Sieries Fights Viscosity Breakdown
Signature Sieries Fights Viscosity Breakdown

AMSOIL vs. Mobil 1

When it comes to motor oil, the competition between AMSOIL and Mobil 1 can be fierce. However, a comparison between the two shows that AMSOIL outperforms Mobil 1 in volatility by a margin of 38%, making it a superior choice for consumers.

AMSOIL Volatility Chart

When looking for synthetic motor oil, it can be difficult to determine which one is the best for your vehicle. AMSOIL and Mobil 1 are two of the most popular brands in the industry, but when put to the test, AMSOIL was proven to have 28% more acid-neutralizing power than Mobil 1! This means that your engine will stay cleaner and longer when using AMSOIL compared to Mobil 1.


Are you using Mobil 1 synthetic motor oil in your high-performance engine? Congratulations on choosing a quality product. But if you want the best engine protection, testing shows that AMSOIL Signature Series Synthetic Motor Oil provides superior performance against viscosity breakdown, volatility, acid and deposits. Make the switch and get superior engine protection with AMSOIL Signature Series Synthetic Motor Oil today!


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