Royal Purple Duralec Super Diesel 5W40 CK-4 Motor Oil - 6 Gallon Bag-In-Box

Duralec Super motor oil is a high performance synthetic engine oil made for those diesel engines requiring the use of an emissions compliant oil for the 2007 and 2010 emissions equipment such as: DPF's, Catalytic Converters, EGR, and SCR injection with the ultra-low sulfur diesel fuels found in North America and Europe. Duralec Super motor oil is specifically formulated to maximize component life, extend drain intervals and improve fuel performance with excellent high temperature break down resistance and low temperature pumpability to minimize cold-induced startup wear.

• API-licensed CK-4 diesel motor oils
• Superior corrosion protection
• Reduces exhaust emissions
• Greater wear protection
• Improves fuel economy
• Keeps engines clean
• Will not harm seals

Royal Purple Duralec Super Diesel 5W-40 CK-4 Motor Oil is a high-performance synthetic diesel engine oil formulated for modern diesel engines equipped with emissions-control systems. The RLP86540 formulation is designed for engines using ultra-low-sulfur diesel fuel in North America and Europe and is compatible with emissions equipment such as diesel particulate filters, catalytic converters, exhaust gas recirculation systems, and selective catalytic reduction systems. It helps support reliable operation while protecting critical engine components under demanding conditions.
The advanced synthetic formula is engineered to maximize component life, support extended drain intervals, and help improve fuel performance. Its strong resistance to high-temperature oil breakdown helps maintain protection during heavy-duty operation, towing, hauling, and sustained engine loads. Excellent low-temperature pumpability promotes faster oil circulation during cold starts, helping minimize startup wear and supporting dependable performance across changing operating conditions.
Royal Purple Duralec Super Diesel meets the API-licensed CK-4 diesel motor oil category and provides a balanced package of wear, corrosion, and deposit protection. It helps keep engines cleaner, protects seals, and supports reduced exhaust emissions when used according to the vehicle or equipment manufacturer’s recommendations. This six-gallon bag-in-box package is suited for diesel vehicles, fleets, commercial equipment, and service applications requiring a high-quality 5W-40 CK-4 synthetic motor oil.

Features:

• API-licensed CK-4 diesel motor oil for compatible heavy-duty diesel applications

• Synthetic 5W-40 formulation supports high-temperature stability and cold-start pumpability

• Designed for modern emissions systems, including DPFs, catalytic converters, EGR, and SCR equipment

• Superior corrosion protection helps protect internal engine components

• Greater wear protection supports extended engine and component life

• Helps reduce exhaust emissions and improve fuel performance

• Keeps engines clean by helping control deposits and sludge

• Seal-compatible formula will not harm engine seals when used as directed

• Six-gallon bag-in-box package for fleet, commercial, and service applications