Castrol EDGE, engineered with FLUID TITANIUM, provides superior motor oil strength for gasoline engines that work harder due to higher engine pressures, helping your vehicle to maximize performance. Advances in engine technology have led to increased power and efficiency, meaning engines work harder and under higher pressures than ever before. The only thing keeping metal engine components apart is the oil, so it needs to be strong and remain strong. Castrol EDGE is our strongest and most advanced range of engine oils. Castrol EDGE, boosted with Fluid Titanium technology, doubles its film strength, preventing oil film breakdown and reducing friction. Castrol EDGE 5W-30 A3/B4 is formulated for highly tuned four-cylinder and latest technology engines that operate at higher temperatures. Its exceptional characteristics ensure that all engine components from the valve train to the bearings are fully lubricated to provide the strength for maximum engine performance.