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Amsoil Celebrating 31 Years of Excellence

Diesel Information

In 1975, AMS OIL introduced a synthetic diesel oil and with it, coined the term "extended drain interval". Since then, AMS OIL synthetic diesel oils have been used as extended drain lubricants in transportation, equipment and stationary engine applications. In every industry, they have proven effective in improving engine durability and fuel economy. AMS OIL customers report significant savings realized through reductions in downtime, parts replacement, lubricant replacement, lubricant disposal, and fuel consumption. Fleet demonstrations and independent testing confirm what AMS OIL customers report: using AMS OIL synthetic diesel oils save money.

Superior Performance

AMS OIL synthetic diesel oils lubricate and protect diesel engines better than conventional lubricants do.

Volatility - AMS OIL synthetic diesel oils' volatility is exceptionally low which keeps oil consumption rates low and inhibits oil thickening. For example AMS OIL Synthetic 15W-40 Heavy Duty Diesel and Marine Oil loses only 6 percent of its mass to volatility in the Noack Volatility Test. Other popular 15W-40 oils lose as much as 13.96 percent.

Thermal Stability - The excellent thermal stability of AMS OIL synthetic diesel oils helps keep oil oxidation rates low, inhibits sludge formation and ensures proper engine lubrication and protection. It is a critical factor in safely extending oil drain intervals.

Oxidation Resistance - AMS OIL synthetic diesel oils offer outstanding oxidation resistance keeps engines cleaner longer for efficient operation and long life. Oxidation resistance is also critical factor in extended drain intervals.

Low Temperature Performance - The cold temperature fluidity of AMS OIL synthetic diesel oils enables cold engines to start easily, protects cold engines from premature wear after engine startup, promotes excellent cold temperature fuel economy and eliminates or reduces the need for inventories of seasonal oils.

Superior Protection

Fully formulated motor oils contain additives that perform functions the lubricating oil basestocks alone can't perform. For example, detergent-alkalinity additives inhibit the formation of deposits on hot engine surfaces and neutralize acids. Dispersants inhibit wear caused by soot and debris. Viscosity index improvers give lubricants multi-grade viscosity. Other additives inhibit lubricant oxidation, metal oxidation, rust and foam or prevent component damage when a full film lubricant isn't present to prevent it.

AMS OIL synthetic diesel oils are formulates with the highest quality additives available to ensure proper lubrication and protection in extended drain use.

Wear Protection

Wear protection is provided by the lubricating oil in areas where a full lubricating film develops between moving parts, such as the bearings. It is provided by anti-wear additives in areas where a full film does not develop, such as as the valve train.

The Four Ball Wear Test (ASTM D4172B), a test designed to measure the effectiveness of anti-wear additives systems, shows AMS OIL Series 3000 Synthetic 5W-30 Heavy Duty Diesel Oil produced wear scars as much as 39 percent smaller than those produced by competing petroleum and synthetic diesel oils. That's significantly better wear protection.

Shear Stability

Some VI improvers break down in demanding operating conditions.  When an oil's VI improver breaks down or shears, the oil no longer retains its intended viscosity over its intended operating range, rendering the oil unable to protect the engine from premature wear in high temperatures.

AMS OIL synthetic diesel oils are highly shear stable. Shear stability is especially important for engines that operate at constant speed, such as stationary engines, marine engines and farm tractors.

TBN and Detergent-Alkalinity

AMS OIL synthetic diesel oils are formulated with 12 Total Base Number (TBN), a high value designed to provide superior control of corrosion and high temperature deposits in extended drain service. Most conventional diesel oils' TBN equals 8.

AMS OIL synthetic diesel oils' highly affective detergent-alkalinity additives help piston crownlands and compression ring zones stay clean, inhibit bore polishing and piston deposits, minimize cylinder wear, minimize ring wear and breakage, and help keep oil consumption low.

The ability of AMS OIL synthetic diesel oils to maintain high TBN values sets these oils apart as superior extended drain lubricants.

Complete Protection

AMS OIL synthetic diesel oils also contain antifoamants to prevent persistent oil foaming, anti-rust agents to inhibit rusting and anti-oxidants and metal deactivators, both of which retard oxidation processes.

Superior Profitability

AMS OIL synthetic diesel oils save diesel operators money through increased fuel economy, increased engine durability, reduced oil inventories and extended lubricant drain intervals.

Fuel Economy

Independent testing and fleet demonstrations show engines equipped with AMS OIL synthetic diesel oils operate with better fuel economy than engines equipped with other diesel oils do. Fuel mileage improvements in excess of three percent have been documented in independent testing.

Engine Durability

Fleet demonstration oil analyses comparing the performance of AMS OIL synthetic diesel oils to competitive products show lower rates of wear metal generation with AMS OIL products.  Engine part inspections confirm the outstanding wear protection provided by AMS OIL synthetic diesel oils.  Lower rates of engine wear improve engine durability, providing longer intervals until first engine teardown, greater intervals between overhauls and longer engine life.

Oil Inventories

The outstanding low temperature fluidity and high temperature protectiveness of AMS OIL synthetic diesel oils eliminate the need for special inventories of seasonal oils. AMS OIL synthetic diesel oils are also formulated for use in gasoline engines, so separate oils for diesel and gasoline engines are also unnecessary.

Extended Drain Intervals

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AMS OIL synthetic diesel oils bear the Mack EO-M, Volvo VDS and VDS 2 labels, showing they meet Volvo's demanding extended drain performance specifications. Fleet demonstration results and the experiences of owner-operators confirm that AMSOIL synthetic diesel oils provide excellent extended drain service.


AMS OIL Synthetic Diesel Oils are available in:

  • AMS OIL Series 3000 Synthetic 5W-30 Heavy Duty Diesel Oil
  • AMS OIL Synthetic 15W-40 Heavy Duty Diesel and Marine Oil
  • AMS OIL Synthetic Blend 15W-40 Gasoline and Diesel Oil
  • AMS OIL Synthetic SAE 30 Diesel Motor Oil
  • Since 1972, AMS OIL Synthetics have proven to be the BEST.

    AMS OIL also engineers and manufactures Super Duty Oil filters which have a 12,500 mile or 6 month service life in gasoline engines and 7000 mile or 6 month service life in diesel engines as well as specialized filtration systems for commercial and fleet applications in cars and light, medium and heavy trucks. These specialized filter systems can filter particles down to less than one micron (a standard AMS OIL full flow oil filter can only filter to 18-25 microns, and at a reduced efficiency) making oil changes virtually unnecessary and virtually eliminating engine wear . These filters have been proven by millions of miles of over-the road trucks, construction equipment and fleet service.

    • AMS OIL saves you time and money.
    • The only 25,000 mile/one- year and 35,000/one- year motor oil in the world.
    • Exceeds the most stringent performance specifications of all major U.S. and foreign automotive and truck manufacturers.
    • Provides up to two-times the wear protection of other motor oils.
    • Increases the life of your vehicle.
    • Improves performance, fuel economy and efficiency.
    • Diesel oil and filtration products designed to deliver 1,000,000 miles for over-the-road trucks before engine overhaul.
    • Used by many national racing teams, fleets, police departments, construction firms and trucking companies.

    The Ultimate in Engine Oils, Greases and Lubricants

    [email protected]

    Phone  208.520.7592

    Toll Free 866.240.8541

    Authorized Amsoil Dealer

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