Royal Purple vs AMSOIL Gear Oil for Automotive: 9 Differences

A proper choice of vehicle gear oil is essential for anyone looking for optimal performance and longevity from their vehicle transmission or differential. Two prominent contenders in the market are Royal Purple and AMSOIL, both renowned for their high-quality gear oils.

Royal Purple uses the Synerlec technology to create a strong lubricating film on metal surfaces. This gear oil suits various applications, including automotive and marine motor gear.

However, AMSOIL employs proprietary additives and synthetic base oils, including friction modifiers and extreme-pressure additives. This provides excellent wear protection, reduces friction, and improves overall performance.

In this comprehensive comparison, we’ll explore the major differences between two top contenders in the automotive gear oil market. Drawing from extensive user experiences and product information, this article will help you make an informed decision. So keep reading.

Differences Between Royal Purple and AMSOIL Gear Oil for Automotive

When comparing AMSOIL and Royal Purple gear oil for automotive use, it’s important to consider several key differences.

• Brand history and reputation
• Unique additive technologies
• Viscosity grade range
• Vehicle compatibility
• Friction reduction and wear protection
• Cold-weather performance
• Compatibility with other oils
• User experiences and recommendations
• Price considerations

1. Brand History and Reputation

Royal Purple, founded in 1986 by John Williams, has established itself as a reputable brand in the industry. It offers a wide range of products with purple synthetic vehicle gear oils for consumers, industry, and commercial use. Its unique offerings and extensive product lines have garnered customer recognition and trust.

Meanwhile, founded in 1972, AMSOIL gained recognition for its 10W-40 car engine oil, the first synthetic oil to meet the American Petroleum Institute’s car requirements.

This brand emphasizes quality and performance, offering a comprehensive catalog of synthetic gear oils for every type of vehicle. With a focus on innovation and meeting industry standards, AMSOIL has built a solid reputation in the market.

2. Unique Additive Technologies

Royal Purple utilizes Synerlec technology to produce a strong lubricating film on gear metal surfaces. This technology reduces gear friction and enhances performance by providing superior protection against metal-to-metal contact. The result is improved vehicle gearbox wear protection and overall performance.

On the other hand, AMSOIL Gear Oil employs proprietary additives and synthetic base gear oils. These additives include friction modifiers and extreme-pressure additives that work together to provide excellent wear protection, reduce abrasion, and improve overall performance.

AMSOIL’s additive technology ensures optimal lubrication and protection for gears, bearings, and other critical vehicle components, enhancing performance and longevity.

3. Viscosity Grade Range

Royal Purple offers a comprehensive range of viscosity grades for gear oil, catering to various performance requirements. Whether you have a high-performance vehicle or a daily driver, Royal Purple has the perfect gear oil to meet your specific needs.

In contrast, AMSOIL also provides various viscosity gear oil grades, ensuring you can find the right product for your vehicle, whether for high-speed racing or heavy-duty trucking.

4. Vehicle Compatibility

Royal Purple automobile gear oil suits various applications, including truck and automotive differentials, outboard motor lower units, and manual transmissions requiring an API fluid. It can be used with open, limited-slip, and locking differentials.

Alternatively, AMSOIL gear oil is engineered to meet high-load demands, making it suitable for many vehicles, from over-the-road trucks to passenger cars. It provides excellent protection against wear, rust, and corrosion, ensuring optimal performance and longevity of your vehicle’s gears.

5. Friction Reduction and Wear Protection

AMSOIL gear oil sets itself apart with its unique iron-sulfide barrier coating on vehicle gear surfaces. This coating acts as a protective shield, preventing wear, pitting, and scoring. AMSOIL gear oil excels in extreme temperatures, maintaining its performance even in hot and cold conditions.

On the other hand, Royal Purple is known for significantly reducing gear and bearing wear, especially under extreme conditions. This is crucial for ensuring the longevity of gears and preventing early failure. Royal Purple also offers excellent corrosion protection, further enhancing gear durability.

6. Cold-Weather Performance

Royal Purple improves cold-weather fluidity and lubricity, ensuring smooth auto gear operation even in sub-zero conditions. This feature makes it an ideal choice for use in cold climates.

Conversely, AMSOIL gear oil enhances fuel economy by improving cold-temperature fluidity and reducing energy lost to friction. This is crucial for efficient performance in cold weather.

By reducing friction and improving fluidity, AMSOIL gear oil allows for smoother gear shifts and reduced wear on components, resulting in improved fuel economy.

7. Compatibility with Other Oils

Royal Purple is known for being compatible with a wide variety of gear oils, allowing users more flexibility when transitioning to their products. This compatibility ensures that users can easily mix Royal Purple gear oil with their existing oil without any negative effects.

On the other hand, AMSOIL may not be as compatible with other oils. This lack of compatibility may influence the user’s choice, especially if they’re particular about mixing products.

8. User Experiences and Recommendations

Users appreciate Royal Purple’s unique purple color, performance characteristics, and wide range of products. Specifically, the Royal Purple HPS has gained attention for its suitability in powerful and modified engines.

In contrast, AMSOIL is renowned for its high-quality oil and the distinction of being the first synthetic oil for cars certified by the American Petroleum Institute. Users frequently recommend AMSOIL for its versatility across various applications.

9. Price Considerations

If you’re looking for a gear oil that balances quality and affordability, Royal Purple and AMSOIL are worth considering. While Royal Purple is known for its premium-quality products, it typically comes with a slightly higher price tag due to its performance-enhancing technology.

However, AMSOIL products are priced competitively, offering a more affordable option without compromising on quality.

Is AMSOIL gear oil better than Royal Purple gear oil?

You will find that AMSOIL gear oil is superior to Royal Purple gear oil. AMSOIL has consistently been rated as the #1 gear oil for auto manual gearboxes, and it has been proven to be among the best by several independent labs.

In terms of performance, AMSOIL gear oil outshines Royal Purple. It provides excellent protection for gears and bearings, reducing wear and extending the life of your equipment.

AMSOIL offers superior thermal stability, ensuring optimal performance even at high temperatures. Also, AMSOIL gear oil has exceptional shear stability, maintaining its viscosity and lubricating properties under heavy loads and extreme conditions.

In fact, AMSOIL gear oil fights viscosity breakdown 46% better than other vehicle gear oils in the market. This remarkable performance results from AMSOIL’s commitment to exceeding industry standards and continuously improving their products.

What gear oil can I mix with AMSOIL?

To ensure optimal performance and longevity of your AMSOIL gear oil, you should only mix synthetic motor gear oils with compatible conventional and synthetic automotive gear oils. However, mixing other gear oils with AMSOIL oils can decrease performance benefits and a shorter life expectancy.

AMSOIL doesn’t recommend extended drain intervals when oils have been mixed. Choose gear oils (if needed) formulated with similar additives and base oils to maintain the intended performance characteristics of the AMSOIL oil.

Can I mix Royal Purple gear oil with AMSOIL gear oil?

Mixing Royal Purple gear oil with AMSOIL gear oil isn’t recommended. While it may be safe to mix AMSOIL with other oils, doing so will dilute the performance benefits of AMSOIL products.

Royal Purple and AMSOIL are two different brands with their own unique formulations and additive packages. Mixing them together can potentially lead to a loss of performance and may compromise the overall effectiveness of the gear oil.

Do Royal Purple and AMSOIL gear oils work well in extreme temperatures?

Both Royal Purple and AMSOIL gear oils perform exceptionally well in extreme temperatures, so your gears run smoothly regardless of the weather. With advanced additives, these gear oils maintain their viscosity and lubricating properties even in high heat or freezing temperatures.

Royal Purple and AMSOIL gear oils resist thinning in hot weather, preventing excessive wear and protecting the gears from damage. Similarly, in cold weather, these gear oils remain fluid, ensuring easy gear shifting and reducing wear on the gears.

Can I mix Royal Purple or AMSOIL gear oils with other brands?

You can effectively mix Royal Purple gear oils with other brands. Royal Purple gear oils have been designed to be compatible with a wide range of oils, allowing for a seamless transition when switching to their products. With this compatibility, your gears will still get optimal performance and protection.

However, AMSOIL gear oils may not be as compatible with other brands. While mixing AMSOIL gear oil with other oils is generally possible, it’s recommended to check with the manufacturer or refer to their compatibility charts to ensure compatibility and avoid any potential issues.

What types of vehicles are suitable for AMSOIL and Royal Purple gear oils??

AMSOIL and Royal Purple gear oils are suitable for various vehicles, including trucks, cars, heavy-duty equipment, and even marine engines. These gear oils are formulated to meet the specific demands of different vehicle types.

For trucks, AMSOIL and Royal Purple gear oils provide excellent protection against extreme temperatures, heavy loads, and high torque. In cars, these gear oils ensure smooth and efficient operation, reducing friction and wear.

Heavy-duty equipment, such as construction machinery and agricultural vehicles, can benefit from the superior protection and durability provided by AMSOIL and Royal Purple gear oils.

Even marine engines operating in harsh marine environments can rely on these gear oils to maintain optimal performance.

Royal Purple vs AMSOIL: Choose the Best Gear Oil for Your Vehicle

Both Royal Purple and AMSOIL offer high-quality gear oils with unique features and advantages. Consider the unique features and benefits of each brand to the best choice for your automotive needs.

The choice between them depends on your specific needs, budget, and performance expectations. While Royal Purple may be favored for its premium formulations and compatibility, AMSOIL is known for its quality and affordability.

Whether you opt for Royal Purple or AMSOIL gear oil, you’re investing in high-quality lubrication that can help extend the life of your vehicle’s gear systems.