AMSOIL Signature Series 5W-40 Max-Duty Diesel Oil
100% synthetic diesel oil option with strong cold-start flow. Verify the required viscosity and specification for your exact engine before ordering.
View 5W-40 at AMSOILTowing Guide
AMSOIL Lubricants for Towing & Heavy Service
Protect the engine and drivetrain by matching every lubricant to the tow vehicle’s exact specification and severe-service requirements.
Featured AMSOIL products
These products are relevant to this guide. Click a product to view current specifications and availability for the selected application.
AMSOIL Signature Series 15W-40 Max-Duty Diesel Oil
100% synthetic diesel oil option for severe-duty applications. Confirm your engine's required viscosity and specifications before ordering.
View 15W-40 at AMSOILProduct images courtesy of AMSOIL INC. Product availability and specifications can change; verify fitment before ordering.
Towing turns maintenance into a whole-vehicle job
Heavy trailers add sustained heat and load to the engine, transmission, axles and cooling system. Premium lubricants can be part of the plan, but the starting point is always the correct specification and the vehicle manufacturer’s severe-service schedule.
Key lubricant areas for tow vehicles
Engine oil
Correct viscosity and specification under sustained load.
Transmission
Heat management and fluid specification matter under towing load.
Differentials
Gear oil protects heavily loaded axle components.
Filtration
Oil, air and fuel filtration are core maintenance items.
Related AMSOIL guides
Frequently asked questions
Does towing require a different engine oil?
Use an oil viscosity and specification approved by the engine manufacturer. Towing can qualify as severe service, so maintenance intervals may also differ from normal service.
What fluids should I check on a tow vehicle?
Along with engine oil, review transmission fluid, transfer-case fluid where applicable, differential gear oil, coolant, brake fluid and other items listed in the manufacturer’s towing or severe-service schedule.