Castrol 03124 Edge 0W-20 Advanced Full Synthetic Motor Oil, 5 Quart Castrol EDGE Strength for Maximum Performance. Engine oils need to be able to constantly respond to the ever-changing environments in your engine. Every second of the drive your engine oil needs to be able to react to the needs of different metal-to-metal contact points in your engine each with different demands, pressures and temperatures. Castrol EDGE provides the highest level of protection for critical engine parts helping your car to perform at its maximum. Castrol EDGE is an advanced full synthetic motor oil with a unique and proprietary formula that reduces volatility and provides superior protection for critical engine parts helping your vehicle operate efficiently at power. Castrol 03084C Edge 5W-30 Advanced Full Synthetic Motor Oil, 5 Quart Castrol edge is Castrol’s most advanced engine oil. It is a premium full synthetic oil that is designed for consumers who demand the best performance from their cars. Castrol EDGE is recommended by leading car manufacturers. Castrol edge is engineered with fluid titanium technology that physically changes the way the oil behaves under pressure. Castrol EDGE is 3X stronger against viscosity breakdown than the leading full synthetic and conventional motor oils. As a result of increased demand for performance and fuel economy, pressures in today’s engines have almost doubled over the last three decades. Greater pressure means more stress for the oil and the potential for more friction. As metal-to-metal contact increases, it causes wear and reduces performance. Underneath the hood, the pressure can reach 10 tons per square centimeter. That’s like five cars resting on a high heel relying only on a micro-thin layer of oil for protection.