Heavy Duty Diesel Engine Oils

AMSOIL Heavy Duty synthetic diesel engine oils provide advanced protection for hardworking diesel engines in trucks, commercial vehicles, fleets and heavy equipment.

AMSOIL Heavy Duty Diesel Oil provides full-synthetic protection for hardworking diesel engines operating under demanding conditions. Formulated for trucks, commercial vehicles, fleets and heavy equipment, the range provides excellent wear protection, engine cleanliness and resistance to oil breakdown under high temperatures and heavy loads.

Browse the AMSOIL Heavy Duty Diesel Oil range below, or use the AMSOIL Vehicle Product Finder to identify the correct viscosity and specifications for your vehicle or equipment.

3 Products Found

AMSOIL Heavy Duty Synthetic Diesel Engine Oil

AMSOIL Heavy Duty Synthetic Diesel Engine Oils are engineered for diesel engines working under demanding loads and operating conditions. Commercial vehicles, towing applications, agricultural equipment and other hard-working diesel engines can subject lubricants to sustained heat, soot loading and mechanical stress, making lubricant durability an important part of engine protection.

Built for Demanding Diesel Service

Heavy-duty diesel oil must protect critical engine components while resisting oxidation, deposit formation and excessive viscosity change. Sustained operation under load can expose the lubricant to high temperatures for extended periods, while combustion by-products must be managed without allowing harmful deposits to accumulate inside the engine.

Viscosity stability is also important in severe service. Oil that permanently shears out of grade may no longer provide the viscosity characteristics intended for the engine. Our article explaining stay-in-grade engine oil provides more detail on mechanical shear and lubricant viscosity stability.

Select by Specification, Not Just Application

The term heavy duty describes the service environment, but the oil must still meet the particular requirements of the engine. Check the required viscosity, diesel performance classification and manufacturer specifications before selecting a product. The AMSOIL Oil Standards Guide provides additional background on lubricant classifications and terminology.