Royal Purple Duralec Ultra 10W-30 CK-4 Diesel Motor Oil - 5 Gallon (Select 1994-2026)

Fits select 1994-2026 vehicles including Ford F-250/F-350 Super Duty, Ram 2500/3500, Nissan Titan XD, and Chevrolet Express 2500/3500.

Royal Purple Duralec Ultra 10W-30 is a high-performance synthetic diesel motor oil engineered for heavy-duty applications ranging from over-the-road trucking and commuting to agriculture, construction, and mining. Formulated with Royal Purple's proprietary Synerlec additive technology, this oil provides up to 4X the film strength and lubricity of leading competitors, significantly reducing friction and engine heat. It is specifically designed to maximize protection in high-output diesel engines, including both modern Tier 4 and older generation powerplants.

This CK-4 rated oil improves engine cleanliness through advanced synthetic solvency, which targets and reduces deposits. Its 10W-30 viscosity profile ensures excellent cold-flow operation and immediate startup protection in low-temperature environments while maintaining superior wear protection that exceeds CK-4 requirements by up to 33%.

• Viscosity Grade: 10W-30
• Service Rating: API CK-4
• Volume: 5 Gallon Pail
• Synerlec Technology: Provides unsurpassed film strength and reduced metal-to-metal contact
• Wear Protection: Up to 33% better than standard CK-4 requirements
• Drain Intervals: Extended life up to 40% better than CK-4 requirements
• Engine Cleanliness: Reduced oil consumption and deposit formation