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AMSOIL Commercial Grade Diesel 15W40


This 15W40 Diesel Oil is a high-performance lubricant formulated explicitly for robust commercial engines. It offers unparalleled wear protection, extending engine life and maintaining peak performance, and is a perfect option for your next synthetic motor oil change. The advanced 15W40 synthetic blend formula ensures optimal fluidity across a vast temperature range, safeguarding engines against extreme conditions. Exceptional detergency keeps engines clean, preventing deposit formations and maintaining optimal oil flow. This diesel oil is tailored for superior fuel economy, reducing operational costs. Suitable for the majority of diesel engines, it meets stringent industry standards, providing enhanced oxidation stability and extended drain intervals, making it a go-to motor oil for commercial fleet operators seeking reliability and efficiency. Key points to consider are:

  • Contains over 50% synthetic components, offering enhanced protection.

  • Provides double the wear protection¹.

  • Aids in maintaining optimal operation of trucks and equipment.

  • Performs exceptionally well in extreme temperatures.

  • Offers exceptional value and superior protection for users looking to upgrade from other synthetic-blend or conventional diesel oils.

    • (Note 1) Based on independent testing in the Detroit Diesel DD13 Scuffing Test, adhering to specification DFS 93K222.


AMSOIL Commercial Grade Diesel 10W30


This diesel engine oil is an elite lubrication solution meticulously designed for high-demand commercial engines and is perfect for your next synthetic motor oil change. This refined synthetic blend formulation offers three significant benefits. First, it imparts unparalleled wear protection to extend engine lifespan and preserve peak functionality. Second, the advanced 10W30 formula assures optimal fluidity, safeguarding against varied temperature extremes, crucial for reliable operation in harsh conditions. Lastly, its superior detergency properties secure engine cleanliness, warding off deposit accumulations and sustaining optimal oil circulation. Ideal for a variety of diesel engines, it provides excellent protection and outstanding value, making it an ideal choice for those seeking efficient operational solutions. Key points for your next service oil change are:

  • Contains over 50% synthetic components, offering elevated protection.

  • Offers twice the wear protection¹.

  • Ensures trucks and equipment maintain peak functionality.

  • Demonstrates superior performance in extreme temperatures.

  • Presents remarkable value and top-notch protection for users desiring an enhancement over other synthetic-blend and standard diesel oils.

    • (Note 1) Subjected to independent testing in the Detroit Diesel DD13 Scuffing Test, meeting specification DFS 93K222.


  • Offers twice the wear protection.

  • Composed of over 50% synthetic base oil.

  • Provides excellent protection at great value.

  • Represents an improvement over conventional diesel oil.

  • Get it for your next synthetic motor oil change project.



AMSOIL Commercial Grade Diesel 15W40

AMSOIL Commercial Grade Diesel Oil is a synthetic blend, meticulously crafted to meet the demanding needs of commercial and heavy-duty engines. This unique formulation promises upgraded protection due to its more than 50% synthetic content, ensuring engines are shielded against wear and tear, and operate at optimal performance levels. It provides double the wear protection, a critical feature validated by third-party testing in the Detroit Diesel DD13 Scuffing Test, adhering to specification DFS 93K222. The motor oil excels in extreme temperatures, maintaining fluidity and protecting engine components. This blend is not just about protection; it also helps in keeping trucks and equipment operating at peak performance, such as Cummins, Caterpillar, Mack and Volvo to name a few, and offers an outstanding value to those seeking to upgrade from conventional or other synthetic-blend oils. Its advanced detergency keeps engines clean, making it a preferred choice for fleet mechanics and maintains high operational efficiency, extending engine life thereby reducing the need for costly auto repair.

This synthetic blend diesel oil (aka. syn oil blend) showcases distinguished superiority in wear protection, maximizing engine longevity and performance. By reducing friction, it optimizes fuel economy, leading to significant savings in operational costs. The robust formulation shields engines against extreme temperatures, soot, and dirt, ensuring optimal functioning under severe conditions. AMS OIL’s enhanced detergency properties prevent sludge formation, maintaining cleaner engines and improving oil flow. It meets stringent specifications and is recommended for a wide range of diesel engines. This engine oil is a great option for those looking to substitute Rotella T5, Chevron Delo, Mobil Delvac and other synthetic blend diesel oils. Notably, the motor oil displays impressive oxidation stability, resisting oil breakdown and maintaining its lubricating properties for extended periods. Users benefit from decreased downtime and maintenance, attributing to increased overall productivity and efficiency in commercial operations. Get it now for your DIY oil change or take it to an oil change near me! Become an AMSOIL Preferred Customer and get up to 25% off on your order!

AMS OIL Skid Steer


AMSOIL Commercial Grade Diesel Oil, a synthetic blend motor oil, has been engineered meticulously to offer optimal solutions for commercial and heavy-duty vehicles and company vehicle fleets. It stands out prominently in the lubrication industry due to its myriad of benefits which not only cater to the protection of engine components but also ensure long-term operational efficiency, leading to enhanced productivity in commercial ventures and reducing the need for costly auto repair.

Enhanced Engine Protection

One of the paramount benefits of this motor oil is its ability to provide superior engine protection. The challenging environments and operational demands of commercial vehicles necessitate an engine oil capable of safeguarding the engine against wear, friction, and deposits. The protective layer formed by this diesel oil shields engine components from the relentless wear and tear that can occur during rigorous operations, extending the lifespan of the engine and reducing the need for frequent maintenance and repairs. This enhanced protection translates to reduced operational interruptions and prolonged engine reliability, crucial factors in maintaining uninterrupted commercial activities and minimizing downtime.

Optimal Viscosity Control

The viscosity control offered by this synthetic blend diesel oil is pivotal. It maintains its viscosity across a broad spectrum of temperatures, ensuring consistent lubrication. By maintaining its thickness and fluidity, it prevents metal-to-metal contact within the engine, reducing the likelihood of component wear and subsequent engine failures. This optimal viscosity control ensures that the oil doesn’t thin out excessively in high temperatures or become too thick in low temperatures, maintaining a stable, protective layer around engine components at all times.

Excellence in Varied Temperatures

Another significant benefit of this synthetic blend diesel oil is its superb performance in both extreme cold and hot temperatures. Its advanced formulation ensures that the oil flows smoothly and maintains its lubricating properties in low temperatures, preventing start-up wear. In scorching conditions, the oil resists thermal breakdown, preventing the formation of sludge and deposits and ensuring that the engine remains clean and operates efficiently. This temperature resilience is especially crucial for commercial vehicles that operate in diverse climatic conditions and need a dependable diesel oil that can adapt to varying environmental demands.

Improved Fuel Efficiency

The synthetic diesel oil also plays a vital role in enhancing fuel efficiency. Its friction-reducing properties allow engine components to move smoothly, minimizing energy loss due to friction and enabling the engine to extract more power from the fuel. This improved fuel efficiency is a boon for commercial operations, where fuel costs constitute a significant portion of operational expenses. Reduced fuel consumption leads to lower emissions, contributing to environmental conservation, a responsibility and often a requirement for modern commercial entities.

Extended Drain Intervals (*With Oil Analysis)

The advanced formulation of this product allows for extended oil drain intervals. Its enhanced oxidation stability prevents the oil from breaking down, even under severe operating conditions, allowing it to maintain its protective and lubricating properties for extended periods. Extended drain intervals translate to reduced oil changes, lower maintenance costs, and decreased environmental impact due to reduced oil disposal needs. For commercial operations aiming for sustainable practices and cost efficiency, this feature is highly advantageous.

Superior Detergency

This motor oil exhibits excellent detergency, which helps in maintaining engine cleanliness. A clean engine operates more efficiently, experiences fewer deposits, and enjoys an extended lifespan. The superior detergency of this diesel oil ensures that sludge, varnish, and other contaminants are kept in suspension, preventing them from adhering to engine components and facilitating their removal during oil change cycles.

Cost Efficiency and Value

The outstanding value provided by this premium oil is manifested in its cost-efficiency. The blend of synthetic and conventional base oils offers a balance of performance and cost, making it an attractive option for commercial entities seeking high-quality engine protection without incurring the premium cost of fully synthetic oils. The reduced need for maintenance, coupled with improved fuel efficiency, translates to substantial savings in operational costs over the long term.

Broad Applicability

AM SOIL products are versatile and applicable to a wide range of diesel engines. This broad applicability is beneficial for commercial operations utilizing a diverse vehicle fleet and equipment, allowing for streamlined oil management practices and inventory simplification, making it easier for fleet mechanics to choose when carrying out service oil change maintenance.


This premium synthetic blend establishes itself as a go-to choice for commercial, vehicle fleets, and heavy-duty applications due to its multitude of benefits, including unparalleled engine protection, optimal viscosity control, and exceptional performance in extreme temperatures. Whether it is maintaining engine cleanliness through superior detergency or improving fuel efficiency, every benefit contributes to enhanced operational efficiency and cost-effectiveness. By choosing AM SOIL, commercial entities can ensure the prolonged life and optimal performance of their engines, maximizing productivity and value in their operations. Looking for a full synthetic engine oil for your diesel engine, see our diesel oil and Max-Duty diesel oil products. Choose this product line for your next oil change project!

AMS OIL Yellow Semi Truck


In the world of engine maintenance and performance, choosing the right oil is a crucial decision, especially for diesel engines that power many commercial and fleet vehicles. While full synthetic oils are often praised for their superior performance, synthetic blend commercial grade diesel oils present a budget-friendly alternative that still offers a range of protective properties and excellent thermal performance and cold weather attributes. For engine mechanics, fleet mechanics, and motor mechanics, understanding the benefits and applications of these oils is key to making informed decisions for maintenance and operation.

Synthetic blend oils are a fusion of conventional mineral oils and synthetic base stocks. This blend aims to provide some of the high-performance characteristics of the best synthetic oil while keeping costs more manageable than full synthetics. This is particularly appealing for commercial applications where cost-effectiveness is as crucial as performance.

One of the standout features of synthetic blend diesel oils is their cold weather performance. In cold temperatures, conventional oils can thicken, making it harder for the engine to turn over and start. This thickening also means that the oil takes longer to circulate, leaving engine parts unprotected at startup, which is a crucial time for wear and tear. Synthetic blend oils by AMS OIL, however, retain more of their fluidity in cold conditions, thanks to the synthetic components in the blend itself. This characteristic ensures quicker and more efficient circulation at startup, providing better protection for the engine, which is particularly beneficial for vehicles used in city car driving and other cold environments.

The protective properties of synthetic blend commercial grade diesel oils are another key aspect. While these oils may not offer the same level of extreme high-temperature performance as full synthetics, they still provide significant improvements over conventional oils. The synthetic portion of the blend enhances thermal stability and oxidation resistance, which helps in preventing the formation of sludge and other harmful deposits within the engine. This aspect is particularly crucial for fleet vehicles, which often endure prolonged operating periods and challenging conditions.

For fleet mechanics managing a number of vehicles, the extended oil life and improved engine cleanliness offered by synthetic blend oils can translate into lower maintenance costs and longer intervals between oil changes. This not only saves money but also reduces vehicle downtime – a critical factor in commercial operations. Moreover, the enhanced lubrication properties can contribute to better fuel economy, further adding to the cost-effectiveness of these oils.

In the realm of DIY oil change and oil change services, synthetic blend oils offer a middle ground that appeals to many. They provide an upgrade over conventional oils without the higher price tag of full syn oil products. This makes them an attractive option for those looking for improved engine performance and protection while keeping an eye on the budget. Whether it's a professional oil change near me installer or a personal maintenance task, using a synthetic blend can make a significant difference in engine health.

For those unsure about the right type of oil for their vehicle, resources like the AMSOIL lookup are invaluable. This tool helps users find the appropriate oil for their specific vehicle model and engine type, taking into account the unique demands of each engine. This ensures that whether it's a fleet vehicle, a commercial truck, or a personal diesel car, the engine receives the best possible care tailored to its specific needs.

In conclusion, synthetic blend commercial grade diesel oils offer a practical and cost-effective solution for a wide range of vehicles, particularly in commercial and fleet applications. They strike a balance between the high performance of the best synthetic engine oil and the affordability of conventional oil. For engine mechanics, fleet mechanics, and motor mechanics providing service oil change maintenance, AMSOIL (aka. AMS OIL, AM SOIL, AMAOIL, AMDOIL or AMZOIL by customers and those in the industry) presents a viable option that delivers protective properties and excellent cold weather performance without significantly impacting the maintenance budget. Whether it's for city car driving, heavy-duty commercial use, or anything in between, synthetic blend diesel oils are a compelling choice for those seeking to optimize engine performance and protection while maintaining cost-effectiveness. Just as a DIY car wash keep the outside of your vehicle looking good, so does buying quality syn oil blend products for your engine. Buy this product now and get it installed at a change oil near me facility today!


Synthetic blend diesel oil represents a unique solution in the world of automotive lubricants, especially for diesel engines. This type of oil combines the best features of conventional mineral oils and full synthetic oils, offering a balance of enhanced performance and cost-effectiveness. Understanding the benefits and applications of synthetic blend diesel oil is crucial for those managing diesel-powered vehicles, whether they're personal trucks or commercial fleets.

The formulation of synthetic blend diesel oil is designed to provide better protection and performance compared to traditional mineral oils, while being more affordable than full synthetic oils. This blend, often referred to as a "syn oil," includes a mixture of synthetic base oil with conventional mineral oil. The synthetic component contributes to improved viscosity stability, enhanced thermal properties, and reduced oil breakdown under high-stress conditions typical in diesel engines. At the same time, the mineral oil component helps to keep the overall cost of the oil lower than a full synthetic alternative.

When it comes to diesel engines, the choice of oil is pivotal due to their unique operational characteristics. Diesel engines typically operate under higher compression ratios and produce more torque at lower RPMs compared to gasoline engines. They also generate more soot and contaminants. These factors necessitate an oil that can withstand harsh conditions while maintaining its lubricating properties. Synthetic blend diesel oils are engineered to meet these requirements, offering better soot control, wear protection, and temperature resistance than conventional oils.

During a service oil change, the use of synthetic blend diesel oil can significantly enhance engine performance. This type of oil maintains its viscosity better over a range of temperatures, ensuring consistent lubrication and protection. It's particularly beneficial in varying operating conditions, where the engine may be subject to both high loads and extended periods of idling. This versatility makes synthetic blend oils an excellent choice for a wide range of diesel applications, from heavy-duty trucks to agricultural equipment.

One of the common questions in vehicle maintenance is "change oil how much?" This refers to both the frequency of oil changes and the amount of oil required. Diesel engines, especially those using synthetic blend oils, often have longer oil change intervals compared to those using conventional oils. The synthetic components in the blend resist thermal breakdown and oxidation, allowing the oil to maintain its protective qualities for a longer period. However, it's essential to follow the manufacturer's guidelines for oil changes, as the interval can vary based on the engine design, usage conditions, and the specific oil formulation.

The use of high-quality oil filters is also a crucial aspect of an oil change and service routine, especially when using synthetic blend oils. Oil filters ensure that any contaminants and particulates are removed from the oil, maintaining its cleanliness and efficacy. A good quality filter is particularly important for diesel engines, where the oil can become contaminated with soot and other combustion by-products.

Brands like AMSOIL (aka. AMS OIL, AM SOIL, AMAOIL, AMDOIL or AMZOIL by customers and those in the industry) offer a range of synthetic blend diesel oils, catering to the diverse needs of diesel engines. These products are formulated to provide enhanced wear protection, temperature stability, and soot control, making them suitable for a variety of diesel applications. When selecting an oil, it's important to choose one that meets or exceeds the specifications set by the engine manufacturer to ensure optimal performance and protection.

In terms of environmental considerations, a full synthetic oil change has often been viewed as the more eco-friendly option, primarily due to the extended oil change intervals and improved engine efficiency. However, synthetic blend oils also offer environmental benefits. By balancing performance and cost, they provide a more accessible option for reducing emissions and improving fuel efficiency for a wider range of users.

An oil change with synthetic oil, whether it's a full synthetic or a synthetic blend, is a critical maintenance task for any diesel engine. The choice between these two types of oil will often depend on specific factors such as the engine's age, operating conditions, and maintenance budget. Synthetic blend oils offer a middle ground, providing many of the benefits of full synthetics at a more affordable price point. As a self serve car cleaning facility is important to your truck or car, so is quality syn oil for the longevity of your engine. Buy now and get it installed at a change oil near me location today!

In conclusion, synthetic blend diesel oil is a practical and efficient choice for many diesel engine applications. Its balanced formulation provides improved protection, performance, and longevity compared to conventional oils, while being more cost-effective than full synthetics. Whether it’s for heavy-duty commercial vehicles or personal diesel-powered trucks, using the right synthetic blend oil, in combination with regular oil changes and quality oil filter, is essential for maintaining engine health and performance. Brands like AMS OIL have developed specific products to meet these needs, ensuring that diesel engines can continue to operate efficiently and reliably under a wide range of conditions.





AMSOIL Authorized Dealer Logo

Along with the myriad advantages of this product, the perks of procuring it through an Authorized AMSOIL Dealer, like HIGHGRADE Lubricants, are substantial. As your designated Dealer, we prioritize delivering authentic products, ensuring top-tier protection for your diesel engine. By creating an AMSOIL account, you can purchase needed items immediately and potentially benefit from discounts and free shipping on most orders! Having a Dealer equates to possessing a discount card and a knowledgeable sales representative to assist you. They possess extensive knowledge about AMS OIL's vast selection of motor oils and lubricants and strive to offer advice suited to your unique needs. We’re here to assist you in navigating through the plethora of products to find the perfect match for your diesel engine's necessities.

Direct purchasing amplifies the overall user experience. Bypassing the tedious endeavor of finding the oil in a brick-and-mortar store, products can be conveniently ordered and dispatched directly to your home or office, facilitating a smooth and straightforward acquisition process. Consequently, you can bring your motor oil to a quick lube shop, like a Take 5 oil change facility or manage it yourself, guaranteeing the constant availability of premium engine oil when your vehicle demands it.


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