Next-Generation Diesel Protection

New Signature Series Max-Duty Synthetic Diesel Oil and Heavy-Duty Synthetic Diesel Oil Provide Best-in-Class Engine Protection.

New Signature Series Max-Duty Synthetic Diesel Oil (DHD, DZF, DEO, DME) replaces Premium Synthetic Diesel Oil (DEO, DME). New Heavy-Duty Synthetic Diesel Oil (ADN, ADO, ADP) replaces OE Synthetic Diesel Oil (OED, OEC).

AMSOIL Signature Series Max-Duty Synthetic Diesel Oil

We invested considerable time and effort developing diesel oil technology worthy of the Signature Series name. New Signature Series Max-Duty Synthetic Diesel Oil meets the challenge on all counts. It represents the top tier of AMSOIL protection and performance for diesel engines, providing 6X more engine protection than required by the stringent Detroit Diesel engine specification.

New Viscosity Options

In addition to 5W-40 and 15W-40 viscosities, the Signature Series line features two new viscosities. Signature Series 5W-30 provides outstanding fuel efficiency and presents an ideal all-fleet option, while Signature Series 0W-40 is formulated specifically to provide easy starts and premium engine protection in cold climates.

Extended-Drain Recommendations Are Back

Our new Signature Series technology carries even more wear protection and viscosity retention than ever, providing turbodiesel pickups exposed to fuel dilution the extra protection needed for extended drain intervals.

6X more engine protection*
Highly optimized detergent package provides the ultimate engine cleanliness and efficiency
Significantly exceeds industry requirements
Full OEM specification coverage
High TBN provides outstanding acid neutralization for long-term engine protection
Reduces oil consumption
Exceptional cold-temperature performance
Top-grade protection for extended drain intervals
Available in 5W-30, 0W-40, 5W-40 and 15W-40 viscosities

AMSOIL Heavy-Duty Synthetic Diesel Oil

Heavy-Duty Synthetic Diesel Oil delivers outstanding protection and performance for customers seeking an upgrade over conventional and other synthetic diesel oils, providing 4X more engine protection than required by the stringent Detroit Diesel engine specification.

Turbo Truck Diesel Oil

In addition to 10W-30 and 15W-40 viscosities, a new 5W-40 viscosity provides excellent, cost-competitive protection for turbodiesel pickups.

4X more engine protection*
Highly optimized detergent package provides outstanding engine cleanliness and efficiency
High TBN provides outstanding acid neutralization for long-term engine protection
Excellent opportunity for price-conscious customers to move up to AMSOIL quality
Reduces oil consumption
Outstanding protection for OEM-recommended drain intervals
Available in 10W-30, 5W-40 and 15W-40 viscosities