AMSOIL 15W-40 Heavy-Duty Diesel and Marine Oil

AMSOIL 15W-40 Heavy-Duty Diesel and Marine Oil is a premium diesel oil providing excellent performance in diesel engines where control of wear and deposits is essential. With a TBN of 12, it neutralizes acids and controls soot thickening from exhaust gas recirculation (EGR) and blow-by. The oil resists heat and breakdown better than conventional oils, extending performance and protection. It's designed for extended drain intervals, reducing motor oil expenses and downtime. The oil controls soot and wear, minimizes oil consumption and emissions, and offers excellent protection in temperature extremes. Suitable for a wide range of applications, including over-the-road trucks, off-road construction, marine engines, and more, it's engineered to keep engines running efficiently and effectively, even in harsh conditions​.

4.9
star rating from
258
total reviews

This AMSOIL product is available in:

Individual Quart Bottles
Cases of 12 Quart Bottles
Individual Gallon Jugs
Cases of 4 Gallon Jugs
Individual 2.5 Gallon Jugs
Cases of 2 2.5 Gallon Jugs
Individual 55 Gallon Drums
275 Gallon Totes
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Product Code:

AMEQT-EA

AMSOIL AMSOIL 15W-40 Heavy-Duty Diesel and Marine Oil Description

AMSOIL 15W-40 Heavy-Duty Diesel and Marine Oil is a premium diesel oil providing excellent performance in diesel engines where control of wear and deposits is essential. With a TBN of 12, it neutralizes acids and controls soot thickening from exhaust gas recirculation (EGR) and blow-by. The oil resists heat and breakdown better than conventional oils, extending performance and protection. It's designed for extended drain intervals, reducing motor oil expenses and downtime. The oil controls soot and wear, minimizes oil consumption and emissions, and offers excellent protection in temperature extremes. Suitable for a wide range of applications, including over-the-road trucks, off-road construction, marine engines, and more, it's engineered to keep engines running efficiently and effectively, even in harsh conditions​.

SAE 15W-40 Synthetic Heavy Duty Diesel & Marine Motor Oil

Premium Protection for Severe-Service Diesels

AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil is a premium diesel oil that provides excellent performance in all types of diesel engines without exhaust aftertreatment systems, where highly effective control of wear and deposits is vital. Engineered with heavy-duty dispersant/detergent additives, its Total Base Number (TBN) of 12neutralizes acids and controls soot thickening from exhaust gas recirculation (EGR) and blow-by to protect against corrosion, cylinder bore polishing (wear), varnish and sludge deposits. AMSOIL 15W-40 Diesel Oil resists heat and breakdown better than conventional petroleum oils for long-lasting performance and protection.

AMSOIL 15W-50 Heavy-Duty Diesel and Marine Oil
Not for use with engines equipped with exhaust aftertreatment systems, including DPF and SCR.

Try Signature Series Max-Duty 15W-40 for a serious upgrade.

Extends Drain Intervals

AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil can extend drain intervals far beyond those recommended for conventional petroleum oils. Its unique synthetic formulation and long-drain additive chemistry deliver maximum engine protection, cleanliness and performance over extended drain intervals, reducing vehicle maintenance and waste-oil disposal costs.

Controls Soot and Wear

AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil is heavily fortified with detergent/dispersant additives and is naturally resistant to soot. It is designed to keep soot particles suspended independently and prevent them from aggregating to form larger, wear-causing particles. Viscosity increase is minimized and soot related wear is reduced.

Reduces Oil Consumption and Emissions

AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil has lower volatility than conventional petroleum oils. Oil consumption and emissions are minimized due to less vapor passing into the combustion chamber. Lower volatility helps AMSOIL 15W-40 Diesel Oil retain its viscosity after high-temperature service for continued dependable protection.

Excellent Cold-Flow Properties

AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil eases cold-weather starting and provides vital startup lubrication to help prevent engine wear. It outperforms conventional 15W-40 petroleum oils and minimizes the impact of cold-weather operation.

TYPICAL TECHNICAL PROPERTIES

Synthetic SAE 15W-40 Heavy Duty Diesel & Marine Motor Oil (AME)

Kinematic Viscosity @ 100°C, cSt (ASTM D445) 15.4
Kinematic Viscosity @ 40°C, cSt (ASTM D445) 112.9
Viscosity Index (ASTM D2270) 143
CCS Viscosity @ -20°C, cP (ASTM D5293) 5173
Pour Point, °C(°f) (ASTM D97) -38(-36)
Four-Ball Wear Test (ASTM D4172), Scar, mm 0.48
NOACK Volatility, % weight loss (g/100g) (ASTM D5800) 4.2
High-Temperature/High-Shear Viscosity (ASTM D5481), cP 4.3
Total Base Number (TBN) (ASTM D2896) 12.1

APPLICATIONS

AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil is engineered for use in a wide variety of light- and heavy-duty applications not equipped with exhaust aftertreatment systems, including over-the-road trucks, off-road construction, marine engines, farm equipment, mining, industrial (pumps & generators) and personal automotive or commercial transportation. It is excellent for use with low- or high-sulfur diesel fuels in standard, turbocharged or supercharged engines, including diesels equipped with EGR systems.

Use AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil in diesel engines, gasoline engines and other applications that require any of the following specifications:

  • SAE 15W-40
  • API CI-4+/CI-4/CH-4/CFCF-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

COMPATIBILITY

AMSOIL Synthetic Heavy Duty Diesel & Marine Oil is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oil, however, will shorten the oil’s life expectancy and reduce the performance benefits.

Aftermarket oil additives are not recommended for use with AMSOIL motor oils.

TECHNICAL SERVICES

For immediate answers to your technical questions call (715) 399-TECH (8324) between 8 a.m. and 5 p.m. Central time or email tech@amsoil.com.

SERVICE LIFE

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 (Operating conditions and drain intervals for severe and normal service are defined by the OEM. Refer to your owner's manual).

Note: Extended 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.

AMSOIL PRODUCT WARRANTY

Using AMSOIL synthetic lubricants or practicing extended drain intervals does not void your new vehicle or equipment manufacturer's warranty. All AMSOIL lubricants and filters are covered by the AMSOIL Limited Warranty For complete information visit AMSOIL.com/warranty.aspx.

HEALTH & SAFETY

This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Safety Data Sheet (SDS). An SDS is available at AMSOIL.com or upon request at 715-392-7101. Keep Out of Reach of Children. Don’t pollute. Return used oil to collection centers.

AMSOIL 15W-40 Heavy-Duty Diesel and Marine Oil Reviews

5

star rating

Walter

Very good quality.

5

star rating

AMS oil purchase

In my opinion this is the best oil product available.

5

star rating

Running hard

It can be -42F winter in northern Ontario or 110F summer in south Texas. I am running this oil in my CAT 3406E since 2006. Changing it at 60K miles. Engine has 3 million miles on and it was rebuilt once since 1996. DO I HAVE TO SAY MORE? Thank you Amsoil!

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