Amsoil vs Mobil 1: An Expert Comparison of Synthetic Oils

When it comes to the world of synthetic motor oils, the brands AMSOIL and Mobil 1 often find themselves at the center of discussion. Comparing these two may not just reveal subtle differences in their chemical formulations but also affect your vehicle’s operation. Both brands have a history of innovation and claims of superior performance, each boasting about unique benefits that might influence a motorist’s preference.

Choosing the right motor oil for a vehicle is more than just selecting a brand; it’s about understanding what sets each option apart. Synthetic oils like AMSOIL and Mobil 1 have been engineered to offer higher levels of protection and efficiency, but through independent testing and analysis, differences emerge that could sway consumer choice especially when factors such as longevity, engine cleanliness, and cost are at stake.

Key Takeaways

• Synthetic motor oils from AMSOIL and Mobil 1 present distinct advantages and challenges.
• Analysis and independent testing play critical roles in differentiating motor oil performance.
• Informed choices between AMSOIL and Mobil 1 can lead to improved vehicle longevity and efficiency.

Evolution of Synthetic Motor Oils: AMSOIL and Mobil 1

The journey into synthetic motor oils began with AMSOIL, whose origins trace back to the 1960s. Al Amatuzio, an aircraft squadron commander, realized the potential of synthetic oil used in jets and began his quest to create a similar product for car engines. His efforts bore fruit in 1966 with his initial synthetic oil formulation, leading to commercial sales by 1968 and the official incorporation of his company in 1969. Initially named “AMZOIL,” a legal challenge from Pennzoil led to a name change to “AMSOIL.” By 1972, AMSOIL set a benchmark as the first synthetic motor oil to meet American Petroleum Institute (API) service requirements. This achievement cemented AMSOIL’s position as an industry pioneer, embracing the slogan “The First in Synthetics.”

The Mobil brand initiated their internal development of synthetic motor oil later on, in 1971, with the establishment of the “New Concept Engine Oil Team.” Mobil unveiled their synthetic engine oil in Europe by 1973 and by the next year, brought Mobil 1 to the US market.

• Historical Timeline:
  • 1966: AMSOIL develops its first synthetic oil.
  • 1970: AMSOIL adopts its official name.
  • 1972: AMSOIL oil meets API service requirements.
  • 1973: Mobil 1 enters the European market.
  • 1974: Mobil 1 available in the US.

Big oil companies were initially skeptical about synthetic oils for fear of losing conventional oil sales, which had frequent change intervals. However, over time, the entire oil industry has transitioned to offer a range of synthetic oils, following AMSOIL’s leadership in the market.

Despite AMSOIL’s head start, both brands have established themselves in the motor oil industry, and the timing of their entry does not directly reflect current product quality. Next, we examine the performance characteristics of both AMSOIL and Mobil 1 oils.

Synthetic Oil Showdown: AMSOIL Versus Mobil 1

AMSOIL’s Premier Line for Gasoline Engines

AMSOIL has positioned their Signature Series range as the frontrunner for gasoline engines. This line includes a variety of viscosity grades such as:

• 0W-20
• 0W-30
• 0W-40
• 5W-20
• 5W-30
• 5W-50
• 10W-30

These oils are designed to provide top-tier protection and performance across different engine types.

Mobil 1’s Top Offering for Gas Engine Lubrication

The Mobil 1 Extended Performance oil is renowned for its promise to deliver up to 20,000 miles of engine protection. It is formulated to meet the demands of diverse driving conditions and is offered in:

• 0W-20
• 5W-20
• 5W-30
• 10W-30

Each viscosity option is aimed at enhancing engine life and efficiency in gasoline-powered vehicles.

Comparative Analysis of Synthetic Motor Oils

Ratings and Specifications

When analyzing synthetic motor oils, specific metrics are crucial in determining their performance and suitability for modern engines. The comparison between AMSOIL’s Signature line and Mobil 1’s Extended Performance series reveals differences in their operational characteristics.

• Viscosity at High Temperatures:
  • AMSOIL Signature Series 5W-30: Exhibits a kinematic viscosity of 10.3 cSt at 100°C.
  • Mobil 1 Extended Performance 5W-30: Slightly lower at 10.15 cSt at the same temperature.
• Viscosity at Moderate Temperatures:
  • AMSOIL Signature Series: 59.7 cSt at 40°C.
  • Mobil 1 Extended Performance: At 58.7 cSt, it remains comparable.
• Viscosity Index:
  • AMSOIL Signature Series: Ranked with a Viscosity Index of 162.
  • Mobil 1 Extended Performance: Close with a Viscosity Index of 163.

The Viscosity Index indicates the change in oil’s viscosity at varying temperatures. A higher index suggests better performance across a range of temperatures.

• High-Temperature/High-Shear Viscosity:
  • AMSOIL Signature Series: Holds a measure of 3.11 cP under high-stress conditions.
  • Mobil 1 Extended Performance: Again in close competition, showing a measure just short of AMSOIL.

This measurement is critical as it shows the oil’s ability to protect engines from wear under extreme conditions.

• Temperature Resistance:
  • Pour Point for AMSOIL Signature Series: -53°C, indicating excellent cold weather performance.
  • Pour Point for Mobil 1 Extended Performance: A marginally higher -33°C.

The lower the pour point, the better the oil will perform in freezing conditions, protecting the engine components like pistons, cams, and bearings.

• Flash Point:

  • AMSOIL Signature Series: 220°C, which shows a decent resistance to igniting in high-heat scenarios.
  • Mobil 1 Extended Performance: It has a higher flash point at 235°C, suggesting slightly better volatility control.

• Acid Neutralization:

  • Total Base Number (TBN) for the AMSOIL Signature Series: Comes at 12.5.
  • Mobil 1 Extended Performance: Has a lower TBN of 9.2.

A higher TBN means the oil can neutralize more acids over time, which could result in longer engine life and better engine performance.

• Cold Crank Viscosity:
  • AMSOIL Signature Series: Shows a CCS of 3968 cP at -30°C.
  • Mobil 1 Extended Performance: Possesses a CCS of 4930 cP at the same temperature.

The ability to maintain viscosity at lower temperatures ensures reliable engine protection at startup.

• Guaranteed Service Life:
  • AMSOIL Signature Series: Offers a substantial guaranteed service life of 25,000 miles, 700 hours, or one year.
  • Mobil 1 Extended Performance: Guarantees coverage for 20,000 miles or one year.

Both oils are designed to meet stringent industry standards. The differing aspects such as viscosity improvers, cleanliness capacities, and performance under various driving conditions uniquely position them for engines requiring advanced wear protection and durability, such as those found in high-horsepower or high-performance engines, including turbocharged, supercharged, and high-RPM engines.

Comparative Assessment of Synthetic Motor Oils

Shear Stability Analysis (ASTM D6278)

In the realm of synthetic oils, shear stability is critical in assessing performance. A rigorous evaluation demonstrates that AMSOIL demonstrates superior resilience against viscosity loss when heated to 100°C, outperforming Mobil 1 by a significant margin. This outcome signifies AMSOIL’s remarkable ability to resist viscosity breakdown under extreme conditions.

Volatility Evaluation (ASTM D5800)

The test for oil volatility is crucial to understanding oil consumption and engine cleanliness. Data from comparative testing indicates that AMSOIL excels in this area, showing substantially lower volatility than its competition. This characteristic ensures a reduced likelihood of oil consumption and enhanced valve cleanliness during the engine’s operation.

Total Base Number Determination (ASTM D2896)

Calculating the Total Base Number (TBN) helps to gauge an oil’s ability to neutralize contaminants. In trials with AMSOIL and Mobil 1, AMSOIL presented a significant advantage, offering greater acid-neutralizing capabilities. This benefit points towards better protection against engine deposits and longer oil life.

Turbocharger Deposit Formation Test (ASTM D6335)

In the TEOST test simulating high-temperature deposit formation, AMSOIL’s performance was markedly better, demonstrating a robust resistance against sludge buildup. This is crucial for maintaining engine cleanliness and efficiency, particularly in severe driving conditions associated with turbocharged engines.

Synthetic Oil Showdown

Comparative Assessment of AMSOIL and Mobil 1

AMSOIL tends to be on the pricier side in contrast to Mobil 1 when viewed from a short-term perspective. For those watching their budget, Mobil 1 might stand out due to its lower initial cost. Yet, factoring in AMSOIL’s extensive 25,000-mile service interval points to potential cost savings over time, appealing to vehicle owners focused on long-term value.

Joining the AMSOIL Preferred Customer Program provides a means to slash up to a quarter off the retail price, including free delivery for substantial orders, tipping the scales of long-term expenditure even more in favor of AMSOIL.

Compatibility and Interaction between AMSOIL and Mobil 1

Mixing AMSOIL with Mobil 1, while safe from a mechanical standpoint, is generally not advised. This combination dilutes the unique performance qualities inherent to each brand. Owners should stick to one brand to maximize the benefits such as engine protection and fuel efficiency that these oils are engineered to provide.

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