−54°F
0W-40
The Alaska grade. A real 0W for a Duramax, Power Stroke, or Cummins that allows 0W-40, with a hot film that still reads 40-weight.
Shop 0W-40
Heavy-duty diesel
Max-Duty, and the rest of the diesel shelf.
The same products AMSOIL lists for heavy-duty diesel equipment. Signature Series Max-Duty first. Filters, fuel additives, transmission fluid, gear lube, grease, and hydraulic oil under that.
Video · 2:08
Watch: Keep diesel fuel from gelling this winter
AMSOIL’s fuel-additive specialist shows how wax in diesel fuel plugs a filter at −10°F, then runs fuel treated with AMSOIL Diesel Cold Flow next to untreated fuel.
Signature Series Max-Duty
Five diesel viscosities. One additive system.
907 Synthetics specs Max-Duty for diesel pickups and heavy equipment. API CK-4. Dealer number 1245102. Gasoline cars stay on the cars page.
Year-round
5W-40
The pickup grade most of the year. Same Max-Duty chemistry when the book says 5W-40 and the mornings are not forty below.
Shop 5W-40
Classic HD
15W-40
The heavy-duty viscosity. Class 8 and equipment that have lived on 15W-40, now on the Max-Duty additive system.
Shop 15W-40
Fuel-efficient
5W-30
For diesels that spec a 5W-30 CK-4 oil. Not a substitute for an engine that calls 15W-40 or 5W-40.
Shop 5W-30
CK-4 10W-30
10W-30
The 10W-30 Max-Duty fill for engines whose manual lists that grade, including many newer pickups.
Shop 10W-30Heavy-duty on- and off-road: up to 3× the OEM interval, not past 60,000 miles, 600 hours, or one year. Turbodiesel pickups: up to 2×, not past 25,000 miles or one year. Unsure of the grade? Call AMSOIL at 1-800-777-7094 with the engine and dealer 1245102.
Heavy-duty synthetic diesel oil
The tier under Max-Duty. Same CK-4 job, follow the interval on the product page.
Commercial-grade and competition
Fleet oils on the OEM interval, plus the competition diesel bottle.
Oil filters
Full-flow for the heavy-duty can, and bypass filters for soot the full-flow leaves behind.
Diesel additives
Fuel treatments. Cold Flow is the Alaska bottle. None of these go in the crankcase.
Automatic transmission fluid
Pickup automatics and the Allison-duty Torque-Drive®. Not for a belt CVT.
Powershift and manual transmission
Off-highway powershift fluids and the long-life SAE 50.
Gear oil
Differentials and heavy gearboxes. SEVERE GEAR® for shock load. Long Life for highway.
Grease
Chassis, off-road pins, and wet fittings.
- AMSOILNLGI #1 Synthetic Polymeric Truck, Chassis and Equipment Grease
- AMSOILNLGI #2 Synthetic Polymeric Truck, Chassis and Equipment Grease
- AMSOILSynthetic Multi-Purpose Grease
- AMSOILNLGI #1 Synthetic Polymeric Off-Road Grease
- AMSOILNLGI #2 Synthetic Polymeric Off-Road Grease
- AMSOILSynthetic Water-Resistant Grease
Hydraulic oil
Tractor hydraulics, anti-wear, multi-viscosity, commercial-grade, and the biodegradable ISO 46.
- AMSOIL5W-30 Synthetic Tractor Hydraulic/Transmission Oil
- AMSOILISO 22 Synthetic Anti-Wear Hydraulic Oil
- AMSOILISO 32 Synthetic Anti-Wear Hydraulic Oil
- AMSOILISO 46 Synthetic Anti-Wear Hydraulic Oil
- AMSOILISO 22 Synthetic Multi-Viscosity Hydraulic Oil
- AMSOILISO 32 Synthetic Multi-Viscosity Hydraulic Oil
- AMSOILISO 46 Synthetic Multi-Viscosity Hydraulic Oil
- AMSOILISO 68 Synthetic Multi-Viscosity Hydraulic Oil
- AMSOILISO 32 Commercial-Grade Hydraulic Oil
- AMSOILISO 46 Commercial-Grade Hydraulic Oil
- AMSOILISO 68 Commercial-Grade Hydraulic Oil
- AMSOILISO 46 Synthetic Biodegradable Hydraulic Oil
- AMSOILCommercial-Grade Tractor Hydraulic/Transmission Oil
Cleaners and protectants
Shop chemicals from the same diesel equipment page.
Look up the engine.
Year, make, and engine for a pickup. Equipment that is not in the garage lookup is on the full heavy-duty category, tagged to dealer 1245102.