AMSOIL specialty product guide
Competition Diesel Oil
Protection for the demands of diesel competition. Start with your engine builder’s requirements, then review the right formulation for your setup.
Trey Campo · Independent AMSOIL Dealer #5573391 | Product guidance from a hands-on owner and equipment operator.
Built for the load. Chosen for the engine.
High-output diesel competition puts exceptional pressure on bearings and oil viscosity. DOMINATOR 20W-50 is designed for performance-modified diesels. Confirm the viscosity and application with your engine builder before ordering.
When should I change it?
Use oil analysis to set competition drain intervals. Outside competition, follow the engine manufacturer’s interval; extend it only with oil-analysis support. Mixing oils is not a basis for an extended interval.
Current AMSOIL references: Reference 1
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AMSOIL DOMINATOR® 20W-50 Competition Diesel Oil
For performance-modified diesel engines requiring a listed specification, including API CK-4/CJ-4. Designed to resist heat and viscosity loss under competition loading. Product code: DCO.
View AMSOIL DOMINATOR® 20W-50 Competition Diesel Oil on AMSOIL
Open Technical Specifications on the corporate page for its current data sheet and safety information.
Confirm your model, year, engine, required specification and service conditions. Use the guidance above and the current corporate instructions for this exact product.
Personal product guidance
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I’m Trey, the owner of Synthetic Oil Depot. Tell me what you drive or operate and I can help you review the product options for your next service.