About 25W-40 Synthetic-Blend Marine Engine Oil
25W-40 Synthetic-Blend Marine Engine Oil for compatible marine engines. Compare the current AMSOIL application information with your equipment’s service documentation before planning the job. Keep the product code WCMQT-EA handy when reviewing package options or asking Jeff a question.
Before you choose
Check your marine engine’s model, oil specification, and viscosity. Confirm whether it is a four-stroke or diesel application; do not substitute crankcase oil for two-stroke injection oil.
Is marine oil interchangeable with automotive oil?
Choose by the engine manufacturer’s requirements and the product’s listed applications. Marine operating conditions and certification requirements may differ from those of road vehicles.
Product information reviewed September 7, 2026. Read AMSOIL’s current details.
