About Signature Series 0W-40 Motor Oil
Signature Series 0W-40 is a gasoline-engine oil option to consider when your vehicle calls for this viscosity and the specifications listed by AMSOIL. Choose the formulation as part of a maintenance plan that accounts for your engine and how you drive.
Before you choose
Confirm that 0W-40 is permitted for your exact engine, then compare the required API, ILSAC, or manufacturer specification with the current product data. A matching viscosity alone does not establish compatibility.
Can I change to this viscosity?
Use 0W-40 only if your vehicle documentation allows it. If you are considering a change from another grade, check the manufacturer’s guidance or ask your technician first.
Product information reviewed September 7, 2026. Read AMSOIL’s current specifications.
