Description Up to 75% of engine wear occurs during the starting and warm-up phase. When the engine stops, oil drains from the critical engine parts.. But the intelligent molecules of Castrol MAGNATEC don't flow away. They cling to the engine like a magnet, offering additional protection. The formulation of Castrol MAGNATEC protects from the very start, significantly reducing engine wear*. Castrol MAGNATEC. Instant protection from startup * According to the industry's Sequence IVA anti-wear test. Application Castrol Magnatec 5W-40 C3 is recommended for petrol and diesel engines when the manufacturer requires a lubricant of SAE 5W-40 grade with performance level ACEA C3, API SN or previous specifications. Product Performances ACEA C3 API SN Plus BMW Longlife-04 Meets Fiat 9.55535-S2 Warranted by Castrol to be completely suitable for use in vehicles where the following specifications apply: MB 229.31/229.51/ 229.52