Heavy-Duty 100% Synthetic Diesel Oil 5W-40

The best Synthetic diesel oil value in Sioux Falls, AMSOIL’s 5W-40 Heavy-Duty Diesel Line

Saves Fuel. Reduces oil consumption. Improves starting. Better Oil Pressure retention. Keeps engine cleaner with less wear in high stress occurrences.

Available inside of the Sioux Falls Stan Houston Equipment Company on W. 12th (Old Kmart)

Formulated for Exceptional Diesel Engine Protection

AMSOIL Heavy-Duty Synthetic Diesel Oil is formulated for hard-working equipment. It is engineered to provide 4X better wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222. This makes it a local best seller in our diesel line.
AMSOIL DEO Heavy-Duty 5W-40 Diesel gives you the edge to keep trucks and equipment operating at peak performance. Heavy-Duty Synthetic Diesel Oil offers outstanding value and provides excellent protection for customers seeking an upgrade over conventional, synthetic-blend or competing synthetic diesel oils.

 

See Pricing & Order!

Printable Heavy Duty Diesel Synthetic Product Line Data Sheet.

Product Data Sheet PDF

Step up to our top tier indestructible Signature-Series 5W-40 if you push the truck beyond it’s limits or need longer intervals.

Heavy-Duty Engine Protection

Wear on rings and cylinder liners leads to increased oil consumption and loss of compression, resulting in reduced horsepower and fuel economy. Independent testing shows AMSOIL Heavy-Duty Synthetic Diesel Oil delivers 4X more wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222 to help maximize equipment life and reduce maintenance costs and downtime.

Viscosity Control

Formulated with advanced synthetic base oils and detergent/dispersant additives, AMSOIL Heavy-Duty Synthetic Diesel Oil minimizes viscosity change while keeping soot particles suspended independently, helping prevent the formation of larger, wear-causing particles. Lower volatility also helps Heavy-Duty Synthetic Diesel Oil retain its viscosity after high-temperature service for added engine protection and increased fuel economy.

Excels in Extreme Temperatures

AMSOIL Heavy-Duty Synthetic Diesel Oil is formulated to deliver improved heat and oxidation resistance compared to conventional diesel oils. It provides clean engine operation and helps maintain power and fuel efficiency for superior engine performance. AMSOIL Heavy-Duty Synthetic Diesel Oil also flows dependably in cold temperatures for easier startup and improved engine protection.

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Minimizes Oil Consumption

AMSOIL Heavy-Duty Synthetic Diesel Oil has a low rate of volatility (burn-off), reducing oil consumption during operation and passing less oil vapor into the combustion chamber. It provides up to 66 percent less oil consumption than required by the API CK-4 standard in the Caterpillar-1N oil consumption test.

 

 

APPLICATIONS

Use in diesel engines and, where appropriate, gasoline engines requiring any of the following specifications:

• API CK-4, CJ-4, CI-4+, CF
• API CF-2
• Volvo VDS4.5, VDS4, VDS3
• Mack EOS-4.5, EO-O
• Renault RLD-4, RLD-3
• Cummins CES20086, CES20081
• Caterpillar ECF-2, ECF-3, ECF-1-a
• DDC 93K218, 93K215, 93K214
• DFS 93K222
• ACEA E9, E7
• MB 228.31
• MAN 3575
• MTU Type 2.1, II, I
• JASO DH-2
• JASO MA, MA2
• Deutz DQC III-10LA
• Chrysler MS 10902
• Ford WSS-M2C171-F1
• Allison TES439

 

COMPATIBILITY

AMSOIL Heavy-Duty Synthetic Diesel Oil is compatible with other conventional and synthetic engine oils. Mixing AMSOIL diesel oils with other oils, however, will reduce the performance benefits.

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

SERVICE LIFE

AMSOIL Heavy-Duty Synthetic Diesel Oil is recommended for the drain intervals stated by the original equipment manufacturer (OEM). Refer to the owners book for specific oil change intervals. Intervals may be extended beyond the OEM recommended interval with oil analysis. (Order KIT02)  Provides lasting protection for multiple events during competition. Use oil analysis to
determine appropriate drain interval for competition use or when
extending drain intervals beyond the OEM recommendation

AMSOIL PRODUCT WARRANTY

AMSOIL products are backed by a Limited Liability Warranty. For complete information visit AMSOIL Warranty Information.

* All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.

Visit your local AMSOIL store at 47073 98th St in Lincoln County or call 605-274-2580

Also stocked at Stan Houston Equipment in Sioux Falls on W. 12th St.

 

 

Heavy-Duty Line Diesel Oil Customer Reviews

 

Amsoil 5w40

By  LOGAN,  a  Verified Buyer  on  August 04, 2025
Amsoil is the only oil I will ever run in any vehicle I care about, I am running this oil in my 6.0 powerstroke, great cold starts in the winter, I’ve had buddies with stiction issues switch to this and cure that after a few hundred miles, not saying it will fix your issues but it’s worth a shot, but I can assure you it will give your engine and injectors a longer life this is top notch oil.

 

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