Diesel oil
Signature Series 15W-40 Max-Duty Diesel Oil
15W-40 Signature Series Max-Duty synthetic diesel oil for compatible diesel engines in demanding service.
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AMSOIL 15W-40 oils by application
Compare AMSOIL 15W-40 engine oils across their listed applications. Choose the correct engine type and specification before selecting a product.
Choose by specification.
A shared 15W-40 grade does not make gasoline, diesel, motorcycle, marine, and small-engine oils interchangeable. Use the application labels below to narrow your choice.
Diesel oil
15W-40 Heavy-Duty Diesel Oil
15W-40 Heavy-Duty synthetic diesel oil for compatible diesel engines in demanding service.
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Diesel oil
15W-40 Heavy-Duty Diesel and Marine Oil
15W-40 Heavy-Duty Diesel and Marine Oil for compatible diesel engines.
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Diesel oil
15W-40 Commercial Grade Diesel Oil
15W-40 Commercial Grade Diesel Oil for compatible diesel engines.
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Diesel oil
Freedom Series 15W-40 Diesel Oil
Freedom Series 15W-40 synthetic diesel oil, developed with Fleece Performance for diesel pickups, with turbo cleanliness and soot control.
Product details Shop at AMSOIL ↗