Royal Purple Duralec Ultra 10W-30 CK-4 Synthetic Diesel Motor Oil - 1 Gallon (Select 1994-2026)

Fits select 1994-2026 AM General, Chevrolet, Dodge, Ford, Freightliner, Hummer, Nissan, and Ram heavy-duty diesel applications.

Royal Purple Duralec Ultra is a high-performance 10W-30 synthetic motor oil specifically engineered for high-output diesel engines. Formulated with proprietary Synerlec additive technology, this oil creates an exceptionally tough ionic bond with metal surfaces, providing up to 4X the film strength of leading competitors to prevent metal-to-metal contact during extreme loads.

This CK-4 rated oil is designed to reduce engine deposits and provide superior cold-flow operation for reliable start-up protection in rigorous on- and off-highway environments. It exceeds standard requirements to help reduce downtime and lower the total cost of ownership for heavy-duty fleets and personal trucks alike.

• Viscosity: 10W-30
• Service Class: API CK-4
• Volume: 1 Gallon
• Additive Technology: Proprietary Synerlec formula
• Wear Protection: Up to 33% better than CK-4 requirements
• Oil Life: Up to 40% better retention than CK-4 requirements
• Improved cold flow operation and start-up protection
• Reduced oil consumption in older generation engines