AMSOIL synthetic diesel oils reduce friction and wear better than conventional oils, helping hard-working diesel engines perform better and last longer. They withstand high-temperature breakdown to help prevent harmful deposits from forming, while remaining fluid in sub-zero temperatures for easier cold starts and nearly immediate circulation and protection.


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Diesel Oils

AMSOIL Premium APICJ-4 Synthetic Diesel Oils

✔ The premium choice for model-year 2007
and newer diesel engines requiring API CJ-4 oils
✔ Compatible with all exhaust treatment devices


15W40 Diesel

15W40 Diesel

AMSOIL 15W-40 Synthetic Heavy Duty
Diesel Marine Oil

✔ Formulated with a high 12 Total Base Number to provide extended drain intervals
✔ Engineered for all on- and off-road
diesel applications not equipped with diesel particulate filters (DPFs)

OE 15W40

AMSOIL OE 15W-40 Synthetic Diesel Motor Oil

✔ Provides excellent performance and protection for the entire duration of OEM-recommended drain intervals
✔ Suitable for applications requiring API CJ-4 oils




AMSOIL Series 3000 5W-30 Synthetic Heavy Duty Diesel Oil

✔ Advanced fuel efficient formula
✔ Delivers increased wear protection compared to other popular diesel oils

The "Perks" of Synthetics....

  • Maximum Fuel Economy – With less resistance to internal moving parts, engines are able to operate at peak efficiency and deliver maximum MPG

  • Extended Drain Intervals – AMSOIL coined the phrase “extended drain interval” nearly 40 years ago. Advanced chemistries allow extended-drain AMSOIL synthetic diesel oils to remain effective up to three times longer than original equipment manufacturer (OEM) recommendations. Motorists benefit significantly through reduced oil costs and increased convenience through fewer oil changes and less used oil disposal.

  • AMSOIL synthetic diesel oils’ advanced lubricity (slipperiness) yields better performance and protection

Diesel MPG

Diesel Savings Chart

You Can Actually Step UP and SAVE!

Diesel Fuel Economy

Diesel Fuel Economy


Air and Oil Filtration

Ea® Synthetic nanofiber technology reduces engine wear by providing
ultra-high filtering efficiency for automotive/light-truck applications.

Amsoil Air & Oil FiltersEngine Protection

Filters that trap a higher percentage of smaller wear particles provide increased
engine protection. AMSOIL Ea Oil Filters trap and hold 98.7 percent of particles 15
microns and larger, while competitive filters containing conventional cellulose media range from 40 to 80 percent efficient.

AMSOIL by-pass filtration systems employ a secondary by-pass filter rated 98.7
percent efficient at two microns, nearly eliminating wear-causing particles.
AMSOIL Ea Air Filters’ synthetic media traps and holds five times more dust than
cellulose media alone and 50 times more than wet-gauze type media, helping stop
dirt before it reaches the engine.

Extended Service

Used with AMSOIL Synthetic Motor Oils, Ea Oil Filters have a maximum recommended service life of either 15,000 miles or 25,000 miles, depending on the application.  Ea Air Filters provide 100,000 miles/four years of service with annual cleaning using a shop vacuum or compressed air. AMSOIL extended-service filters save motorists time and money.


Drivetrain Fluids

Premium synthetic drivetrain lubricants reduce wear, extend service
life and maximize fuel economy.

Amsoil ATF & GreaseSynthetic Transmission Fluids

AMSOIL synthetic transmission fluids withstand the rigors of high-horsepower/hightorque diesels better than conventional fluids. They maintain viscosity for reduced gear and bearing wear and increased equipment life. Their synthetic formulations resist oxidation, varnish formation and sludge build-up to provide superior cooling and lubrication.

Synthetic Gear Lubes

AMSOIL synthetic gear lubes protect heavily loaded
differentials better than conventional lubes. Extreme pressure formulations guard against metal-to-metal
contact for maximum wear control. Their synthetic
chemistries reduce friction and drag for increased fuel
efficiency while providing extended drain intervals.

Synthetic Greases

AMSOIL synthetic greases resist pound-out and washout better than conventional greases. They seal out contaminants and provide superior lubrication throughout extended service intervals.


Diesel Fuel Additives & Engine Coolants

Diesel Fuel Additives

  • AMSOIL Cetane Boost – Improves combustion efficiency to increase power in diesel engines.  Raises cetane up to seven numbers.
  • AMSOIL Cold Flow Improver – Helps prevent icing or gelling in fuel.
  • AMSOIL Diesel Concentrate – Cleans fuel system components, increasing fuel economy by up to 5 percent.
  • AMSOIL Diesel Concentrate Plus Cold Flow Improver – Reduces cold filter-plugging point as much as 34°F while also maximizing fuel economy.
  • AMSOIL Diesel Recovery – Quickly liquefies gelled diesel fuel, thaws frozen fuel filters and reduces the need for a new filter.
  • AMSOIL Antifreeze & Engine Coolant – Surpasses standards for metallic corrosion and provides superior
    cooling and protection for 250,000 miles/seven years in autos/light trucks.


About AMSOIL Synthetics ….

AMSOIL introduced the world’s first synthetic motor oil for diesel engines in 1975 and dramatically redefined the performance
and protection available to diesel owners. Today, AMSOIL is the recognized leader in synthetic lubricant technology and offers a
variety of exclusive synthetic diesel oil formulations, each tailored to meet the unique demands of modern, hard-working diesel engines. Motorists worldwide chose AMSOIL synthetic diesel oils for the extraordinary benefits they provide.