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AMSOIL Diesel & Heavy-Duty Products

Compare diesel engine oil families, specialty formulations and natural gas engine oils. Start with the engine’s required viscosity and performance specification, then consider its service conditions. A familiar brand or vehicle badge alone does not establish compatibility.

Browse Diesel & Heavy-Duty

Before choosing a product

Max-Duty, Heavy-Duty and Commercial-Grade are separate product families. Compare their individual application information and service guidance before choosing. Competition and break-in products require a different selection process from everyday road-vehicle oils. Natural gas engine oils are listed separately because their applications are not interchangeable with diesel engines.

These are product categories and possible applications, not verified vehicle fitment. Check the individual product page and your equipment requirements before ordering.

Related maintenance & purchasing

These links cover additional maintenance tasks. Confirm the application on each destination before selecting a product.