Heavy-Duty Diesel 15W-40 AMSOIL's best competing value in a TRUE synthetic. Run it the full interval and do an oil anlysis!
This is our middle tier Diesel Oil line. 100% Synthetic for less money yet it still outperforms all the major brands. If you are not going for the extended intervals this is the best value. Watch your oil pressure! Consistency from start to finish. Lowers oil consumption. Be sure to get a case of Cetane Boost while you’re at it!
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, giving 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.
Heavy-Duty Diesel Line Data Sheets – constantly updated
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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 15W-40 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.
Order a case and save! Available in quarts, gallons, 2.5 (10 QT) jugs or cases of each.
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Heavy-Duty 15W-40 is 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.
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.
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.
Use in diesel engines and, where appropriate, gasoline engines requiring any of the following specifications:
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.
In colder climates we suggest the 5W-40 version.
AMSOIL Heavy-Duty Synthetic Diesel Oil is recommended for the drain intervals stated by the original equipment manufacturer (OEM). Refer to the owner’s manual for the specific oil change interval. Intervals may be extended beyond the OEM-recommended interval with oil analysis.
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