
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 AMSOILMatch AMSOIL engine and drivetrain products to your Ford Super Duty or Power Stroke application.
These products are relevant to this guide. Click a product to view current specifications and availability for the selected application.

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 AMSOIL
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.
Ford Power Stroke trucks span multiple engine and transmission generations, so there is no single oil or fluid that fits every truck. Use the exact year, engine and drivetrain in the AMSOIL lookup before choosing products.
A real-world 6.0L Power Stroke oil-change video provides hands-on context for diesel engine oil and filter maintenance.
For tow vehicles, the maintenance plan should include the engine, automatic transmission or manual gearbox, transfer case where applicable, and front and rear differentials. Our Super Duty pages use original service videos to explain these areas.
AMSOIL offers multiple diesel-engine oils. The correct product depends on your Power Stroke generation, model year, viscosity requirement and required performance specification.
AMSOIL offers several transmission fluids, but the exact product must match the transmission specification. Use the vehicle lookup before selecting a fluid.