Clinging molecules protect from the start Why CASTROL MAGNATEC? Up to 75% of engine wear occurs while your engine warms up. When the engine stops, oil normally drains off critical engine parts, but Castrol MAGNATECs intelligent molecules dont. They cling to the engine like a magnet, providing an extra layer of protection. Castrol MAGNATECs unique formulation protects from the moment you start, dramatically reducing* engine wear. Protect your engine from the moment you start, by selecting the right oil for your vehicle from the Castrol MAGNATEC range. * As tested in the industry Sequence IVA wear test.