For Light- and Heavy-Duty Applications Including Marine Engines, Over-the-Road Trucks, Off-Road Construction, Farm and Industrial Equipment
Formulated for Both Gasoline and Diesel Fuel Engines
Controls Soot Loading from Exhaust Gas Recirculation (EGR) Systems and Blowby
AMSOIL Full Synthetic 15w40 Heavy-Duty Diesel and Marine Engine Oil (Product Code: AME) is a premium oil engineered for use in a wide variety of light- and heavy-duty applications, including marine engines, pre-2007 over-the-road trucks, off-road construction, farm equipment, mining, industrial (pumps & generators) and personal automotive or commercial transportation. It provides excellent performance in all types of diesel engines where highly effective control of wear and deposits is vital. AMSOIL 15w40 Diesel Marine Oil has been put to the test over millions of miles in heavy-duty trucks and is proven to provide unsurpassed engine protection, even when used much longer than conventional diesel oils are used.
AMSOIL Synthetic 15w40 Heavy-Duty Diesel and Marine Engine Oil provides clean engine performance. Built with heavy-duty dispersant/detergent additives, its high 12-TBN chemistry neutralizes acids and controls soot loading from exhaust gas recirculation (EGR) and blow-by to protect against corrosion, cylinder bore polishing (wear), ring sticking and varnish and sludge deposits. AMSOIL 15w40 Diesel Marine Oil resists heat and breakdown better than conventional petroleum oils for long-lasting performance and protection. It can extend oil change intervals far beyond those recommended for conventional oils; extended oil change intervals reduce downtime, motor oil expenses and waste oil disposal costs.
AMSOIL Synthetic 15w40 Heavy-Duty Diesel and Marine Engine Oil is formulated for use in both gasoline and diesel fuel engines. It is excellent for use with low- or high-sulfur diesel fuels in standard, turbocharged or supercharged engines, including diesels equipped with EGR systems. Meets API CI-4+, CI-4, CH-4, CF, CF-2, SL, SJ specifications.
- Contains 12 TBN for long-term acid control and a stay-in-grade formulation
- Reduces oil consumption and emissions
- Resistant to soot
- Resists varnish and sludge formation
- Excels in both hot- and cold-weather extremes, eliminating the need for seasonal oils
- Dissipates foam for better fuel injection and engine power
- Formulated for both gasoline and diesel engines
- Extended oil change intervals
AMSOIL Full Synthetic 15w40 Heavy-Duty Diesel and Marine Engine Oil Product Code Pkg/Size AMEQT-EA Quart Bottle AMEQT-CA Quart Bottles (case of 12) AME1G-EA Gallon Bottle AME1G-CA Gallon Bottles (case of 4) AMETP-EA 2.5-Gallon Bottle AMETP-CA 2.5-Gallon Bottles (case of 2) AME30-EA 30-Gallon Drum AME55-EA 55-Gallon Drum AME27-EA 275-Gallon Tote
Reduces Oil Consumption and Emissions
AMSOIL Full Synthetic 15w40 Heavy-Duty Diesel and Marine Engine Oil has lower volatility (evaporation) than conventional petroleum oils. Lower volatility means AMSOIL 15w40 Diesel Marine Oil retains its viscosity at temperatures and loads that break down conventional oils, offering continued dependable protection. Lower volatility also means less make-up oil is required to replace volatilized oil and less oil vapor passes into the combustion chamber, reducing oil consumption and exhaust emissions.
Controls Excessive Soot Loading Found in EGR Diesel Engines
AMSOIL 15w40 Heavy-Duty Diesel and Marine Engine Oil is heavily fortified with detergent/dispersant additives and is naturally resistant to soot. It is designed to keep soot particles suspended independently, preventing them from attaching together to form larger, wear-causing particles. Viscosity increase is minimized and soot-related diesel engine wear is controlled.
Excels in Cold Weather
Unlike conventional petroleum oils, AMSOIL Synthetic 15w40 Heavy-Duty Diesel and Marine Engine Oil contains no wax. It stays fluid down to -40°F for improved cold-temperature oil flow, providing vital start-up lubrication for easier starts and reduced wear. AMSOIL 15w40 Marine Diesel Oil outperforms conventional 15w40 petroleum oils and greatly minimizes the impact of cold-weather operation.
An All-Season Oil That Eliminates the Need for Special Inventories of Seasonal Oils
AMSOIL 15w40 Heavy-Duty Diesel and Marine Engine Oil will not shear back to a lower viscosity. This is especially important for engines that operate continually at constant speed, such as marine engines, stationary engines and farm tractors. Traditionally, such engines have been lubricated with high-viscosity single-grade oils, such as SAE 40, to avoid oil shear-back (which sometimes occurs with multi-viscosity oils using low-quality viscosity index improvers). However, single-grade oils are too thick to allow easy starting and quick engine lubrication in cold temperatures. AMSOIL 15w40 Diesel Marine Oil provides the high-temperature protection of an SAE 40 and the low-temperature pumpability of a 15w oil throughout its entire service life. All-season, all-temperature AMSOIL 15w40 Diesel Marine Oil eliminates the need for special inventories of seasonal oils.
Prevents Rust and Corrosion – Important to Marine Engines and Farm Equipment
AMSOIL Synthetic 15w40 Heavy-Duty Diesel and Marine Engine Oil contains special rust and corrosion inhibitors that protect engines from internal rust, which is especially important for marine engines or equipment that is stored long-term, such as farm equipment.
Less Foam Means Better Drivability
Some vehicles have been known to suffer drive-ability problems due to oil foaming. Foamy oil interferes with fuel injection, which reduces engine power. The ASTM D892 Diesel Oil Foam Test, Sequences 2 and 4, are used to evaluate diesel oils on their foaming characteristics.
According to test results, AMSOIL Synthetic Diesel Oils are clearly less prone to foaming (see graph). Not only are AMSOIL Synthetic Diesels Oils less prone to foaming, they also dissipate foam more quickly and excel in comparison to Shell Rotella T, a popular diesel oil often recommended by some engine manufacturers.
Formulated for Both Diesel and Gasoline Engines
Though it is designed for diesel engines, AMSOIL Synthetic 15w40 Heavy-Duty Diesel and Marine Engine Oil may also be used in gasoline engines, so separate oils for diesel and gasoline powered equipment or vehicles are not needed.
Extended Oil Change Intervals
AMSOIL Synthetic 15w40 Heavy-Duty Diesel and Marine Engine Oil is a proven long-drain oil and can extend oil change intervals far beyond those recommended for conventional oils. Its unique synthetic formulation and long-drain additive system delivers maximum engine protection, cleanliness and performance over extended oil drain intervals, reducing vehicle maintenance and waste oil disposal costs. AMSOIL 15w40 Diesel Marine Oil is recommended for extended oil change intervals in unmodified, mechanically sound vehicles or equipment as follows:
Diesel Engine Service: Three times (3X) OEM* recommendation, not to exceed 50,000 miles/600 hours or one year, whichever comes first. Drain intervals may be extended further with oil analysis.
Gasoline Engine Service: Two times (2X) OEM* recommendation, not to exceed 15,000 miles or one year, whichever comes first.
*Original Equipment Manufacturer. Operating conditions and drain intervals for severe and normal service are defined by the OEM. Refer to your owner’s manual.
Note: Extended oil drain intervals are not recommended when using biofuels containing >10% ethanol or 10% biodiesel (B10). Follow OEM drain intervals or extend drain intervals with oil analysis.
Oil Filter Service Intervals
Extended oil change intervals are based on the user following AMSOIL recommended oil filter service intervals. Install a new oil filter at time of oil change.
- AMSOIL Ea Oil Filters and Donaldson Endurance Oil Filters are full flow oil filters designed for extended oil drain intervals. They stop smaller particles, have less restriction and last longer than regular oil filters. For best performance, use AMSOIL Ea or Donaldson Endurance oil filters. If using other brands of oil filters, install a new oil filter at time of oil change then change at the OEM’s (original engine manufacturer) recommended filter change intervals.
- For maximum engine and oil life, AMSOIL Ea Bypass Oil Filters are specialized for the removal of small, wear-causing dirt particles. These filters are placed outside the main line of oil circulation, using an AMSOIL Bypass Oil Filtration System mount.
Please visit our Oil Filter page to see all of these products and more.
Good to Know
- For best results, use AMSOIL Engine and Transmission Flush before installing AMSOIL synthetic motor oil.
- For maximum engine protection, use an AMSOIL Ea Extended Life Oil Filter.
- AMSOIL recommends checking the oil at a minimum of every 3,000 miles to maintain proper fill levels and maximum engine protection.
- Oil Analyzers, Inc., a division of AMSOIL, Inc., provides cost effective, quality oil analysis services.
- Most quick lube service centers will install these products upon request or you can install them yourself.
AMSOIL Synthetic 15w40 Heavy-Duty Diesel and Marine Engine Oil (AME) is engineered for use in a wide variety of light- and heavy-duty applications, including over-the-road trucks, off-road construction, marine engines, farm equipment, logging and mining equipment and industrial (pumps & generators). It is ideal for personal automotive or commercial transportation, such as taxi and local delivery fleets, with gasoline or diesel engines. It is excellent for use with low- or high-sulfur diesel fuels in standard, turbocharged or supercharged engines, including modern low-emission diesels such as those equipped with exhaust gas recirculation (EGR) systems.
AMSOIL Synthetic 15w40 Heavy-Duty Diesel and Marine Engine Oil is recommended for diesel engines, gasoline engines and other applications that require any of the following specifications:
- SAE 15w40
- API CI-4+, CI-4, CH-4, CF, CF-2, SL, SJ
- ACEA A3/B3, E2, E3, E5, E7
- Global DHD-1
- JASO DH-1
- Mack EO-M, EO-N
- DDC 93K214
- Caterpillar ECF-1A, ECF-2
- Cummins CES 20076, 20077, 20078
- Volvo VDS-2, VDS-3
- MB 228.1, 228.3, 229.1
- MAN 271, 3275
- MTU Type II
Shipping for Online and Catalog Customers
Online and catalog customers receive FREE standard ground shipping on orders of $100 or more when shipped to a valid address in the continental United States, including APO and FPO military post boxes. AMSOIL does not ship to PO Boxes. The $100 minimum does not include taxes, fees or other charges. For online and catalog retail orders totaling less than $100, a flat shipping rate of $8.50 will apply in the continental U.S.
Please Note: AMSOIL Dealers and Preferred Customers are not eligible for free shipping. Orders containing only clothing and promotional materials totaling less than $20 are subject to $5 shipping and handling.
For more information, please visit the AMSOIL, Inc. website: AMSOIL Shipping, Sales Tax and Product Return Guidelines
Please visit the AMSOIL, Inc. website: AMSOIL Shipping, Sales Tax and Product Return Guidelines