Castrol Magnatec Diesel is a part synthetic engine oil that combines dedicated diesel technology with Intelligent Molecules that cling to critical engine parts, providing an extra layer of protection during the crucial warm-up period. Castrol Magnatec Diesel is always ready to protect your engine. Castrol Magnatec Diesel 15W-40 is a superior lubricant that: - Clings to metal surfaces giving extra protection against engine wear - Made with dedicated diesel technology to maintain engine efficiency and responsiveness - Provides excellent soot handling performance thus minimising oil thickening - Exceeds the most demanding limits in latest industry standard diesel protection test Castrol Magnatec Diesel 15W-40 is suitable for use in automotive diesel engines where the manufacturer recommends API CF or ACEA A3/B3, A3/B4 or earlier specifications including: TDI, DI, inter-cooled, turbo charged engines, CRDi engines that require a 15W-40 lubricant. Not recommended for heavy commercial vehicle application or vehicles fitted with diesel particulate filters (DPF).