Royal Purple 87456 Duralec Ultra SAE 10W-30 Diesel Motor Oil

Royal Purple Duralec Ultra SAE 10W-30 is a premium full-synthetic diesel engine oil engineered for high-performance diesel applications. Formulated with Royal Purple's proprietary Synerlec additive technology, Duralec Ultra delivers exceptional wear protection, extended drain intervals, and outstanding performance under extreme operating conditions.

Key Features:

• Advanced Synthetic Formulation: Full-synthetic base oil provides superior film strength and thermal stability compared to conventional diesel oils
• Synerlec Technology: Royal Purple's proprietary additive technology forms a tenacious protective film on metal surfaces, dramatically reducing wear
• Extended Drain Intervals: Engineered to maintain viscosity and protective properties far beyond conventional oil change intervals
• Outstanding Oxidation Resistance: Resists oil breakdown and sludge formation even under high-heat, high-load diesel operating conditions
• Corrosion Protection: Guards internal engine components against rust and corrosion during both operation and storage
• Foam Control: Superior anti-foaming properties ensure consistent oil pressure and lubrication delivery
• SAE 10W-30 Viscosity: Provides excellent cold-start protection while maintaining optimal film thickness at operating temperatures

Royal Purple Duralec Ultra 10W-30 meets or exceeds API CJ-4 diesel engine oil requirements and is compatible with diesel particulate filters (DPF) and other modern emissions control systems. It is suitable for use in turbocharged and naturally aspirated diesel engines found in light-duty trucks, heavy-duty applications, and commercial equipment. Royal Purple's Duralec Ultra line is trusted by diesel enthusiasts and professional fleet operators who demand maximum protection and performance from their engines.